November 28, 2015
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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.)


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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