Last updated on RxList: 4/11/2018
Vecamyl Side Effects Center

Medical Editor: John P. Cunha, DO, FACOEP

Last reviewed on RxList 4/11/2018

Vecamyl (mecamylamine hcl tablet) is an antihypertensive drug and ganglion blocker used to manage moderately severe to severe essential hypertension and in uncomplicated cases of malignant hypertension. Common side effects of Vecamyl include:

The initial dose of Vecamyl is one 2.5 mg tablet twice a day. This initial dosage may be modified by increments of one 2.5 mg tablet at intervals of not less than 2 days until the desired blood pressure response occurs. Vecamyl may interact with antibiotics, sulfonamides, anesthesia, other antihypertensive drugs, and alcohol. Tell your doctor all medications and supplements you use. Tell your doctor if you are pregnant or plan to become pregnant before using Vecamyl; it is unknown how it would affect a fetus. Because of the potential for serious adverse reactions in nursing infants, breastfeeding while using Vecamyl is not recommended.

Our Vecamyl (mecamylamine hcl tablet) Side Effects Drug Center provides a comprehensive view of available drug information on the potential side effects when taking this medication.

This is not a complete list of side effects and others may occur. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.


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Vecamyl Consumer Information

Get emergency medical help if you have signs of an allergic reaction: hives; difficult breathing; swelling of your face, lips, tongue, or throat.

Call your doctor at once if you have:

  • tremors or jerky muscle movements;
  • numbness, tingling, burning pain;
  • painful or difficult urination;
  • ongoing diarrhea with stomach bloating;
  • confusion, thinking problems;
  • a light-headed feeling, like you might pass out;
  • a seizure; or
  • dry cough, wheezing, feeling short of breath (even while lying down).

Common side effects may include:

  • dizziness or fainting;
  • nausea, vomiting, loss of appetite;
  • constipation;
  • dry mouth, swollen tongue;
  • feeling weak or tired;
  • blurred vision; or
  • impotence, decreased interest in sex.

This is not a complete list of side effects and others may occur. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.

Read the entire detailed patient monograph for Vecamyl (Mecamylamine HCl Tablets)


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Vecamyl Professional Information


The following adverse reactions have been reported and within each category are listed in order of decreasing severity.

Gastrointestinal: Ileus, constipation (sometimes preceded by small, frequent liquid stools), vomiting, nausea, anorexia, glossitis and dryness of mouth.

Cardiovascular: Orthostatic dizziness and syncope, postural hypotension.

Nervous System/Psychiatric: Convulsions, choreiform movements, mental aberrations, tremor, and paresthesias (see WARNINGS).

Respiratory: Interstitial pulmonary edema and fibrosis.

Urogenital: Urinary retention, impotence, decreased libido.

Special Senses: Blurred vision, dilated pupils.

Miscellaneous: Weakness, fatigue, sedation.

Read the entire FDA prescribing information for Vecamyl (Mecamylamine HCl Tablets)

© Vecamyl Patient Information is supplied by Cerner Multum, Inc. and Vecamyl Consumer information is supplied by First Databank, Inc., used under license and subject to their respective copyrights.

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