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Vecamyl Side Effects

Generic name: mecamylamine

Note: This document contains side effect information about mecamylamine. Some dosage forms listed on this page may not apply to the brand name Vecamyl.

Applies to mecamylamine: oral tablet.


Follow all directions on your medicine label and package. Tell each of your healthcare providers about all your medical conditions, allergies, and all medicines you use.

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:

This is not a complete list of side effects and others may occur. Call your doctor for medical advice about side effects.

For Healthcare Professionals

Applies to mecamylamine: oral tablet.

Nervous system

Frequency not reported: Orthostatic dizziness and syncope, convulsions, choreiform movements, mental aberrations, tremor, paresthesias, sedation[Ref]


Frequency not reported: Ileus, constipation, vomiting, nausea, glossitis, dry mouth[Ref]


Frequency not reported: Urinary retention, impotence[Ref]


Frequency not reported: Blurred vision, dilated pupils[Ref]


Frequency not reported: Weakness, fatigue[Ref]


Frequency not reported: Interstitial pulmonary edema and fibrosis[Ref]


Frequency not reported: Postural hypotension[Ref]


Frequency not reported: Anorexia[Ref]


Frequency not reported: Decreased libido[Ref]


1. "Product Information. Inversine (mecamylamine)." Merck & Co., Inc (2001):

Further information

Always consult your healthcare provider to ensure the information displayed on this page applies to your personal circumstances.

Some side effects may not be reported. You may report them to the FDA.