Guanethidine Monosulfate (Ismelin)
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Guanethidine Monosulfate (Ismelin)

Discontinued Warning IconPlease Note: This Brand Name drug is no longer available in the US.
(Generic versions may still be available.)

DRUG DESCRIPTION

Ismelin, guanethidine monosulfate USP, is an antihypertensive, available as tablets of 10 mg and 25 mg for oral administration. Each 10-mg and 25-mg tablet contains guanethidine monosulfate USP equivalent to 10 mg and 25 mg of guanethidine sulfate USP. Its chemical name is [2-(hexahydro-1(2H)-azocinyl)ethyl] guanidine sulfate 1:1.

Guanethidine monosulfate USP is a white to off-white crystalline powder with a molecular weight of 296.38. It is very soluble in water, sparingly soluble in alcohol, and practically insoluble in chloroform.

Inactive Ingredients: Calcium stearate, colloidal silicon dioxide D&C Yellow No. 10 (10-mg tablets), lactose, starch, stearic acid, and sucrose.

Last reviewed on RxList: 12/8/2004
This monograph has been modified to include the generic and brand name in many instances.

Discontinued Warning IconPlease Note: This Brand Name drug is no longer available in the US.
(Generic versions may still be available.)

INDICATIONS

Ismelin (guanethidine monosulfate) is indicated for the treatment of moderate and severe hypertension, either alone or as an adjunct, and for the treatment of renal hypertension, including that secondary to pyelonephritis, renal amyloidosis, and renal artery stenosis.

High blood pressure can cause the heart and arteries to not function properly. This can damage the blood vessels of the brain, heart, and kidneys, resulting in a stroke, heart failure, or kidney failure. High blood pressure may also increase the risk of heart attacks. These problems may be less likely to occur if blood pressure is controlled.

DOSAGE AND ADMINISTRATION

Better control may be obtained, especially in the initial phases of treatment, if the patient can have his blood pressure recorded regularly at home.

Adults- At first, 10 or 12.5 milligrams (mg) once a day. Then, your doctor may increase your dose to 25 to 50 mg once a day.

Children-The dose is based on body weight and must be determined by your doctor. The usual dose is 200 micrograms (mcg) per kilogram (kg) (90.9 mcg per pound) of body weight a day. Then, your doctor may increase your dose as needed.

Ambulatory Patients

Initial doses should be small (10 mg) and increased gradually, depending upon the patient's response. Ismelin (guanethidine monosulfate) has a long duration of action; therefore, dosage increases should not be made more often than every 5-7 days, unless the patient is hospitalized.

Blood pressure should be measured in the supine position, after standing for 10 minutes, and immediately after exercise if feasible. Dosage may be increased only if there has been no decrease in the standing blood pressure from previous levels. The average daily dose is 25-50 mg; only one dose a day is usually required.

Dosage Chart for Ambulatory Patients

Visits (intervals of 5-7 Days) Daily Dose
Visit 1
(Patient may be started on 10-mg tablets)
10 mg
Visit 2 20 mg
Visit 3
(Patient may be changed to 25-mg tablets whenever convenient)
30 mg
(three 10-mg tablets)
or 37.5 mg
(one and one-half 25-mg tablets)
Visit 4 50 mg
Visit 5 and subsequent Dosage may be increased by 12.5 mg or 25 mg if necessary.

The dosage should be reduced in any of the following situations:

  1. normal supine pressure;
  2. excessive orthostatic fall in pressure;
  3. severe diarrhea.

Hospitalized Patients

Initial oral dose is 25-50 mg, increased by 25 mg or 50 mg daily or every other day, as indicated. This higher dosage is possible because hospitalized patients can be watched carefully. Unless absolutely impossible, the standing blood pressure should be measured regularly. Patients should not be discharged from the hospital until the effect of the drug on the standing blood pressure is known. Patients should be told about the possibility of orthostatic hypotension and warned not to get out of bed without help during the period of dosage adjustment.

Combination Therapy

Ismelin (guanethidine monosulfate) may be added gradually to thiazides and/or hydralazine. Thiazide diuretics enhance the effectiveness of Ismelin (guanethidine monosulfate) and may reduce the incidence of edema. When thiazide diuretics are added to the regimen in patients taking Ismelin (guanethidine monosulfate) , it is usually necessary to reduce the dosage of Ismelin (guanethidine monosulfate) . After control is established, the dosage of all drugs should be reduced to the lowest effective level.

Note: When Ismelin (guanethidine monosulfate) is replacing MAO inhibitors, at least 1 week should elapse before commencing treatment with Ismelin (see CONTRAINDICATIONS). If ganglionic blockers have not been discontinued before Ismelin (guanethidine monosulfate) is started, they should be gradually withdrawn to prevent a spiking blood pressure response during the transfer period.

HOW SUPPLIED

Tablets 10 mg - round, pale yellow, scored (imprinted CIBA 49)

Bottles of 100 NDC 0083-0049-30

Tablets 25 mg - round, white, scored (imprinted CIBA 103)

Bottles of 100 NDC 0083-0103-30

Do not store above 86° F (30° C).
Dispense in tight container (USP).

Last reviewed on RxList: 12/8/2004
This monograph has been modified to include the generic and brand name in many instances.

Discontinued Warning IconPlease Note: This Brand Name drug is no longer available in the US.
(Generic versions may still be available.)

SIDE EFFECTS

The following adverse reactions have been observed but there are not enough data to support an estimate of their frequency. Consequently the reactions are categorized by organ system and are listed in decreasing order of severity and not frequency.

Digestive: Diarrhea, which may be severe at times and necessitate discontinuance of medication; vomiting; nausea; increased bowel movements, dry mouth; parotid tenderness.

Cardiovascular: Chest pains (angina); bradycardia; a tendency toward fluid retention and edema with occasional development of congestive heart failure.

Respiratory: Dyspnea; asthma in susceptible individuals; nasal congestion.

Neurologic: Syncope resulting from either postural or exertional hypotension; dizziness; blurred vision; muscle tremor; ptosis of the lids; mental depression; chest paresthesias; weakness; lassitude; fatigue.

Muscular: Myalgia.

Genitourinary: Rise in BUN; urinary incontinence; inhibition of ejaculation; nocturia.

Metabolic: Weight gain

Skin and Appendages: Dermatitis; scalp hair loss.

Although a causal relationship has not been established, a few instances of blood dyscrasias (anemia, thrombocytopenia, and leukopenia) and of priapism or impotence have been reported.

Read the Ismelin (guanethidine monosulfate) Side Effects Center for a complete guide to possible side effects »

DRUG INTERACTIONS

Concurrent use of Ismelin (guanethidine monosulfate) and rauwolfia derivatives may cause excessive postural hypotension, bradycardia, and mental depression.

Both digitalis and Ismelin (guanethidine monosulfate) slow the heart rate.

Thiazide diuretics enhance the antihypertensive action of Ismelin (see DOSAGE AND ADMINISTRATION).

Amphetamine-like compounds, stimulants (e.g., ephedrine, methylphenidate), tricyclic antidepressants (e.g., amitriptyline, imipramine, desipramine) and other psychopharmacologic agents (e.g., phenothiazines and related compounds), as well as oral contraceptives, may reduce the hypotensive effect of Ismelin (guanethidine monosulfate) .

MAO inhibitors should be discontinued for at least 1 week before starting therapy with Ismelin (guanethidine monosulfate) .

Last reviewed on RxList: 12/8/2004
This monograph has been modified to include the generic and brand name in many instances.

Discontinued Warning IconPlease Note: This Brand Name drug is no longer available in the US.
(Generic versions may still be available.)

WARNINGS

Ismelin (guanethidine monosulfate) is a potent drug and its use can lead to disturbing and serious clinical problems. Before prescribing, physicians should familiarize themselves with the details of its use and warn patients not to deviate from instructions.

Orthostatic hypotension can occur frequently, and patients should be properly instructed about this potential hazard. Fainting spells may occur unless the patient is forewarned to sit or lie down with the onset of dizziness or weakness. Postural hypotension is most marked in the morning and is accentuated by hot weather, alcohol, or exercise. Dizziness or weakness may be particularly bothersome during the initial period of dosage adjustment and with postural changes, such as arising in the morning. The potential occurrence of these symptoms may require alteration of previous daily activity. The patient should be cautioned to avoid sudden or prolonged standing or exercise while taking the drug.

Inhibition of ejaculation has been reported in animals (see

PRECAUTIONS

: Carcinogenesis, Mutagenesis Impairment of Fertility) as well as in men given Ismelin (guanethidine monosulfate) . This effect, which results from the sympathetic blockade caused, by the drug's action, is reversible after Ismelin (guanethidine monosulfate) has been discontinued for several weeks. The drug does not cause parasympathetic blockade, and erectile potency is, usually retained during administration of Ismelin (guanethidine monosulfate) . The possible occurrence of inhibition of ejaculation should be kept in mind when considering the use of guanethidine in men of reproductive age.

If possible, therapy should be withdrawn 2 weeks prior to surgery to reduce the possibility of vascular collapse and cardiac arrest during anesthesia. If emergency surgery is indicated, preanesthetic and anesthetic agents should be administered cautiously in reduced dosage. Oxygen, atropine, vasopressors, and adequate solutions for volume replacement should be ready for immediate use to counteract vascular collapse in the surgical patient. Vasopressors should be used only with extreme caution, since Ismelin (guanethidine monosulfate) augments responsiveness to exogenously administered norepinephrine and vasopressors; specifically, blood pressure may rise and cardiac arrhythmias may be produced.

PRECAUTIONS

General

Dosage requirements may be reduced in the presence of fever.

Special care should be exercised when treating patients with a history of bronchial asthma; asthmatic patients are more apt to be hypersensitive to catecholamine depletion, and their condition may be aggravated.

The effects of Ismelin (guanethidine monosulfate) are cumulative over long periods; initial doses should be small and increased gradually in small increments.

Ismelin (guanethidine monosulfate) should be used very cautiously in hypertensive patients with: renal disease and nitrogen retention or rising BUN levels, since decreased blood pressure may further compromise renal function; coronary insufficiency or recent myocardial infarction, and cerebrovascular disease, especially with encephalopathy.

Ismelin (guanethidine monosulfate) should not be given to patients with severe cardiac failure except with extreme caution since Ismelin (guanethidine monosulfate) may interfere with the compensatory role of the adrenergic system in producing circulatory adjustment in patients with congestive heart failure.

Patients with incipient cardiac decompensation should be watched for weight gain or edema, which may be averted by the concomitant administration of a thiazide.

Ismelin (guanethidine monosulfate) should be used cautiously in patients with a history of peptic ulcer or other chronic disorders that may be aggravated by a relative increase in parasympathetic tone.

Information for Patients

See PATIENT INFORMATION section.

Drug Interactions

See DRUG INTERACTIONS section.

Carcinogenesis, Mutagenesis, Impairment of Fertility

Long-term carcinogenicity studies in animals have not been conducted with Ismelin (guanethidine monosulfate) .

While inhibition of sperm passage and accumulation of sperm debris have been reported in rats and rabbits after several weeks of administration of Ismelin (guanethidine monosulfate) , 5 or 10 mg/kg per day, subcutaneously or intraperitoneally, recovery of ejaculatory function and fertility has been demonstrated in rats given Ismelin (guanethidine monosulfate) intramuscularly, 25 mg/kg per day, for 8 weeks. Inhibition of ejaculation has also been reported in men (see

WARNINGS

and ADVERSE REACTIONS). This effect, which is attributable to the sympathetic blockade caused by the drug, is reversible several weeks after discontinuance of the drug.

Pregnancy Category C

Animal reproduction studies have not been conducted with Ismelin (guanethidine monosulfate) . It is also not known whether Ismelin (guanethidine monosulfate) can cause fetal harm when administered to a pregnant woman or can affect reproduction capacity. Ismelin (guanethidine monosulfate) should be given to a pregnant woman only if clearly needed.

Nursing Mothers

Ismelin (guanethidine monosulfate) is excreted in breast milk in very small quantity. Caution should be exercised when Ismelin (guanethidine monosulfate) is administered to a nursing woman.

Pediatric Use

Safety and effectiveness in pediatric patients have not been established.

Last reviewed on RxList: 12/8/2004
This monograph has been modified to include the generic and brand name in many instances.

Discontinued Warning IconPlease Note: This Brand Name drug is no longer available in the US.
(Generic versions may still be available.)

OVERDOSE

No deaths due to acute poisoning have been reported Oral LD50 in rats: 1262 mg/kg.

If overdose is suspected, contact your local poison control center or emergency room immediately. Symptoms of overdose may include fainting or severe dizziness, unusually slow pulse, nausea, and vomiting.

Signs and Symptoms

Postural hypotension (with dizziness, blurred vision, and possibly syncope when standing), shock, and bradycardia are most likely to occur; diarrhea (possibly severe), nausea, and vomiting may also occur. Unconsciousness is unlikely if adequate blood pressure and cerebral perfusion can be maintained by placing the patient in the supine position and by administering other treatment as required.

Treatment

There is no specific antidote.

Treatment should consist of gastric lavage. An activated charcoal slurry should be instilled and laxatives given, if conditions permit.

In sinus bradycardia, atropine should be administered.

In previously normotensive patients, treatment has consisted essentially of restoring blood pressure and heart rate to normal by keeping the patient in the supine position. Normal homeostatic control usually returns gradually over a 72-hour period in these patients.

In previously hypertensive patients, particularly those with impaired cardiac reserve or other cardiovascularrenal disease, intensive treatment may be required to support vital functions and to control cardiac irregularities that might be present. The supine position must be maintained; if vasopressors, are required, they must be used with extreme caution, since Ismelin (guanethidine monosulfate) may increase responsiveness, causing a rise in blood pressure and development of cardiac arrhythmias.

Diarrhea, if severe or persistent, should be treated, with anticholinergic agents to reduce intestinal hypermotility; hydration and electrolyte balance should be maintained.

Since Ismelin (guanethidine monosulfate) is excreted slowly, cardiovascular and renal function should be monitored for a few days.

CONTRAINDICATIONS

Known or suspected pheochromocytoma; hypersensitivity; frank congestive heart failure not due to hypertension; use of monoamine oxidase (MAO) inhibitors.

Last reviewed on RxList: 12/8/2004
This monograph has been modified to include the generic and brand name in many instances.

Discontinued Warning IconPlease Note: This Brand Name drug is no longer available in the US.
(Generic versions may still be available.)

CLINICAL PHARMACOLOGY

Ismelin (guanethidine monosulfate) acts at the sympathetic neuroeffector junction by inhibiting or interfering with the release and/or distribution of the chemical mediator (presumably the catecholamine norepinephrine), rather than acting at the effector cell by inhibiting the association of the transmitter with its receptors. In contrast to ganglionic blocking agents, Ismelin (guanethidine monosulfate) suppresses equally the responses mediated by alpha-and beta-adrenergic receptors but does not produce parasympathetic blockade. Since sympathetic blockade results in modest decreases in peripheral resistance and cardiac output, Ismelin (guanethidine monosulfate) lowers blood pressure in the supine position. It further reduces blood pressure by decreasing the degree of vasoconstriction that normally results from reflex sympathetic nervous activity upon assumption of the upright posture, thus reducing venous return and cardiac output more. The inhibition of sympathetic venoconstrictive mechanisms results in venous pooling of blood. Therefore, the effect of Ismelin (guanethidine monosulfate) is especially pronounced when the patient is standing. Both the systolic and diastolic pressures are reduced.

Other actions at the sympathetic nerve terminal include depletion of norepinephrine. Once it gains access to the neuron, Ismelin (guanethidine monosulfate) accumulates within the intraneuronal storage vesicles and causes depletion of norepinephrine stores within the nerve terminal. Prolonged oral administration of Ismelin (guanethidine monosulfate) produces a denervation sensitivity of the neuroeffector junction, probably resulting from the chronic reduction in norepinephrine released by the sympathetic nerve endings. Systemic responses to catecholamines released from the adrenal medulla are not prevented and may even be augmented as a result of this denervation sensitivity. A paradoxical hypertensive crisis may occur if Ismelin (guanethidine monosulfate) is given to patients with pheochromocytoma or if norepinephrine is given to a patient receiving the drug.

Due to its poor lipid solubility, Ismelin (guanethidine monosulfate) does not readily cross the blood-brain barrier. In contrast to most neural blocking agents, Ismelin (guanethidine monosulfate) does not appear to suppress plasma renin activity in many patients.

Pharmacokinetics

The pharmacokinetics of Ismelin (guanethidine monosulfate) are complex. The amount of drug in plasma and in urine is linearly related to dose, although large differences occur between individuals because of variation in absorption and metabolism. Adrenergic blockade occurs with a minimum concentration in plasma of 8 ng/ml; this concentration is achieved in different individuals with dosages of 10-50 mg/day at steady state. Ismelin (guanethidine monosulfate) is eliminated slowly because of extensive tissue binding. After chronic oral administration, the initial phase of elimination with a half-life of 1.5 days is followed by a second phase of elimination with a half-life of 4-8 days. The renal clearance of Ismelin (guanethidine monosulfate) is 56 ml/min. Ismelin (guanethidine monosulfate) is converted by the liver to three metabolites, which are excreted in the urine. The metabolites are pharmacologically less active than Ismelin (guanethidine monosulfate) .

Last reviewed on RxList: 12/8/2004
This monograph has been modified to include the generic and brand name in many instances.

Discontinued Warning IconPlease Note: This Brand Name drug is no longer available in the US.
(Generic versions may still be available.)

PATIENT INFORMATION

The patient should be advised to take Ismelin (guanethidine monosulfate) exactly as directed. If the patient misses a dose, he or she should be told to take only the next scheduled dose (without doubling it).

The patient should be advised to avoid sudden or prolonged standing or exercise and to arise slowly, especially in the morning, to reduce the orthostatic hypotensive effects of dizziness, lightheadedness, or fainting.

DO NOT SHARE THIS MEDICINE with others for whom it was not prescribed. DO NOT USE THIS MEDICINE for other health conditions. KEEP THIS MEDICINE out of the reach of children. IF USING THIS MEDICINE FOR AN EXTENDED PERIOD OF TIME, obtain refills before your supply runs out.

The patient should be cautioned about ingesting alcohol, since it aggravates the orthostatic hypotensive effects of Ismelin (guanethidine monosulfate) .

Male patients should be advised that guanethidine may interfere with ejaculation.

Last reviewed on RxList: 12/8/2004
This monograph has been modified to include the generic and brand name in many instances.

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Discontinued Warning IconPlease Note: This Brand Name drug is no longer available in the US.
(Generic versions may still be available.)

PATIENT INFORMATION

The patient should be advised to take Ismelin (guanethidine monosulfate) exactly as directed. If the patient misses a dose, he or she should be told to take only the next scheduled dose (without doubling it).

The patient should be advised to avoid sudden or prolonged standing or exercise and to arise slowly, especially in the morning, to reduce the orthostatic hypotensive effects of dizziness, lightheadedness, or fainting.

DO NOT SHARE THIS MEDICINE with others for whom it was not prescribed. DO NOT USE THIS MEDICINE for other health conditions. KEEP THIS MEDICINE out of the reach of children. IF USING THIS MEDICINE FOR AN EXTENDED PERIOD OF TIME, obtain refills before your supply runs out.

The patient should be cautioned about ingesting alcohol, since it aggravates the orthostatic hypotensive effects of Ismelin (guanethidine monosulfate) .

Male patients should be advised that guanethidine may interfere with ejaculation.

Last reviewed on RxList: 12/8/2004
This monograph has been modified to include the generic and brand name in many instances.

Discontinued Warning IconPlease Note: This Brand Name drug is no longer available in the US.
(Generic versions may still be available.)

Ismelin Patient Information Including Side Effects

Brand Names: Ismelin

Generic Name: guanethidine (Pronunciation: gwha NETH ih deen)

What is guanethidine (Ismelin)?

Guanethidine lowers blood pressure by decreasing the levels of certain chemicals in the blood. This allows your blood vessels (veins and arteries) to relax (widen).

Guanethidine is used to treat hypertension (high blood pressure). Guanethidine is also used to treat high blood pressure in the kidneys.

Guanethidine may also be used for purposes other than those listed in this medication guide.

What are the possible side effects of guanethidine (Ismelin)?

If you experience any of the following serious side effects, stop taking guanethidine and seek emergency medical attention or contact your doctor immediately:

  • an allergic reaction (difficulty breathing; closing of the throat; swelling of the lips, tongue, or face; or hives);
  • irregular heartbeats;
  • heart failure (shortness of breath, swelling of ankles or legs, sudden weight gain of 5 pounds or more); or
  • chest pain.

Other, less serious side effects are more likely to occur. Continue to take guanethidine and talk to your doctor if you experience

  • unusual fatigue or drowsiness;
  • dizziness (avoid standing up to quickly and use caution when performing hazardous activities);
  • anxiety, depression, or nightmares;
  • diarrhea, nausea, or vomiting (take guanethidine with food or milk if it upsets your stomach);
  • stuffy nose or a dry mouth (sucking on ice chips or sugarless hard candy may relieve a dry mouth);
  • blurred vision;
  • weight gain; or
  • impotence or difficulty ejaculating.

Side effects other than those listed here may also occur. Talk to your doctor about any side effect that seems unusual or that is especially bothersome.

Read the Ismelin (guanethidine monosulfate) Side Effects Center for a complete guide to possible side effects »

What is the most important information I should know about guanethidine (Ismelin)?

Use caution when driving, operating machinery, or performing other hazardous activities. Guanethidine may cause dizziness or drowsiness. If you experience dizziness or drowsiness, avoid these activities.

Use caution when rising from a sitting or lying position, especially first thing in the morning. Dizziness may occur while taking guanethidine and may result in a fall.

Do not stop taking guanethidine suddenly without first talking to your doctor. This could cause severely high blood pressure, nervousness, and anxiety.

Before having surgery, tell your doctor or dentist that you are taking this medication.

Side Effects Centers

Discontinued Warning IconPlease Note: This Brand Name drug is no longer available in the US.
(Generic versions may still be available.)

Ismelin Patient Information including How Should I Take

What should I discuss with my healthcare provider before taking guanethidine (Ismelin)?

You cannot take guanethidine if you

  • have pheochromocytoma;
  • have congestive heart failure; or
  • are taking a monoamine oxidase inhibitor such as isocarboxazid (Marplan), phenelzine (Nardil), or tranylcypromine (Parnate).

Before taking this medication, tell your doctor if you

  • have peptic ulcer disease (stomach ulcers) or another stomach disease;
  • have gallstones,
  • have kidney disease;
  • have any type of heart disease;
  • have asthma;
  • have ulcerative colitis;
  • are suffering from depression (especially if you have suicidal thoughts); or
  • are receiving electroconvulsive shock therapy.

You may require a dosage adjustment or special monitoring during treatment if you have any of the conditions listed above.

Guanethidine is in the FDA pregnancy category C. This means that it is not known whether guanethidine will be harmful to an unborn baby. Do not take guanethidine without first talking to your doctor if you are pregnant or could become pregnant during treatment.

Guanethidine passes into breast milk and may be harmful to a nursing infant. Do not take guanethidine without first talking to your doctor if you are breast-feeding a baby.

How should I take guanethidine (Ismelin)?

Take guanethidine exactly as directed. If you do not understand these directions, ask your pharmacist, nurse, or doctor to explain them to you.

Take each dose with a full glass of water.

Take guanethidine with food or milk if it causes stomach upset.

It is important to take guanethidine regularly to get the most benefit.

Do not stop taking guanethidine suddenly without first talking to your doctor. This could cause severely high blood pressure, nervousness, and anxiety.

Your doctor may want you to have blood pressure monitoring or other medical evaluations during treatment with guanethidine to monitor progress and side effects.

Store this medication at room temperature away from moisture and heat.

Side Effects Centers

Discontinued Warning IconPlease Note: This Brand Name drug is no longer available in the US.
(Generic versions may still be available.)

Ismelin Patient Information including If I Miss a Dose

What happens if I miss a dose (Ismelin)?

Take the missed dose as soon as you remember. However, if it is almost time for the next dose, skip the dose you missed and take only the next regularly scheduled dose. Do not take a double dose of this medication.

What happens if I overdose (Ismelin)?

Seek emergency medical attention if an overdose is suspected.

Symptoms of a guanethidine overdose include low blood pressure (fainting, dizziness, weakness); a slow pulse; low body temperature; diarrhea; and slow breathing.

What should I avoid while taking guanethidine (Ismelin)?

Use caution when driving, operating machinery, or performing other hazardous activities. Guanethidine may cause dizziness or drowsiness. If you experience dizziness or drowsiness, avoid these activities.

Use caution when rising from a sitting or lying position, especially first thing in the morning. Dizziness may occur while taking guanethidine and may result in a fall.

Avoid alcohol while taking guanethidine. It may increase drowsiness an dizziness caused by guanethidine. Use caution even with small amounts of alcohol.

Guanethidine may increase the effects of other drugs that cause drowsiness, including antidepressants, alcohol, antihistamines, pain relievers, anxiety medicines, seizure medicines, and muscle relaxants. Dangerous sedation, dizziness, or drowsiness may occur if guanethidine is taken with any of these medications. Tell your doctor about all medicines that you are taking, and do not take any medicine without first talking to your doctor.

Avoid becoming overheated in hot weather or during exercise. Also avoid standing for long periods of time and use caution if you have a fever. These situations increase the effects of guanethidine in the body and may cause dizziness.

Before having surgery, tell your doctor or dentist that you are taking this medication.

What other drugs will affect guanethidine (Ismelin)?

Do not take guanethidine without first talking to your doctor if you have taken a monoamine oxidase inhibitor (MAOI) such as isocarboxazid (Marplan), phenelzine (Nardil), or tranylcypromine (Parnate) in the last 14 days.

Before taking this medication, tell your doctor if you are taking any of the following medicines:

  • haloperidol (Haldol);
  • methylphenidate (Ritalin);
  • minoxidil (Loniten);
  • thiothixene (Navane);
  • respiratory medicines such as albuterol (Ventolin, Proventil, Volmax, others), pirbuterol (Maxair), salmeterol (Serevent), and others;
  • phenothiazines such as chlorpromazine (Thorazine), prochlorperazine (Compazine), perphenazine (Trilafon), fluphenazine (Prolixin), thioridazine (Mellaril), and others; or
  • tricyclic antidepressants such as amitriptyline (Elavil, Endep), imipramine (Tofranil), doxepin (Sinequan), nortriptyline (Pamelor), and others.

You may require special monitoring or a dose adjustment if you are taking any of the medicines listed above.

Drugs other than those listed here may also interact with guanethidine or affect your condition. Talk to your doctor and pharmacist before taking any prescription or over-the-counter medicines, including vitamins, minerals, and herbal products.

Where can I get more information?

Your pharmacist has additional information about guanethidine written for health professionals that you may read.


Remember, keep this and all other medicines out of the reach of children, never share your medicines with others, and use this medication only for the indication prescribed.

Every effort has been made to ensure that the information provided by Cerner Multum, Inc. ('Multum') is accurate, up-to-date, and complete, but no guarantee is made to that effect. Drug information contained herein may be time sensitive. Multum information has been compiled for use by healthcare practitioners and consumers in the United States and therefore Multum does not warrant that uses outside of the United States are appropriate, unless specifically indicated otherwise. Multum's drug information does not endorse drugs, diagnose patients or recommend therapy. Multum's drug information is an informational resource designed to assist licensed healthcare practitioners in caring for their patients and/or to serve consumers viewing this service as a supplement to, and not a substitute for, the expertise, skill, knowledge and judgment of healthcare practitioners. The absence of a warning for a given drug or drug combination in no way should be construed to indicate that the drug or drug combination is safe, effective or appropriate for any given patient. Multum does not assume any responsibility for any aspect of healthcare administered with the aid of information Multum provides. The information contained herein is not intended to cover all possible uses, directions, precautions, warnings, drug interactions, allergic reactions, or adverse effects. If you have questions about the drugs you are taking, check with your doctor, nurse or pharmacist.

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