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Generic Name: mecamylamine (meck a MILL a meen)
Brand Name: Vecamyl
Physician reviewed Vecamyl patient information - includes Vecamyl description, dosage and directions.
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Drug Information:
Vecamyl is used to treat moderate to severe hypertension (high blood pressure). Because of its many side effects, this medicine is not commonly used. Vecamyl is also used to treat malignant hypertension (extremely high blood pressure that comes on suddenly). Malignant hypertension can damage organs in the body if left untreated. Vecamyl may also be used for purposes not listed in this medication guide. 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. Learn more

Vecamyl Side Effects

Vecamyl Side Effects

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

For the Consumer

Applies to mecamylamine: oral tablet

What are some side effects that I need to call my doctor about right away?

WARNING/CAUTION: Even though it may be rare, some people may have very bad and sometimes deadly side effects when taking a drug. Tell your child's doctor or get medical help right away if your child has any of the following signs or symptoms that may be related to a very bad side effect:

  • Signs of an allergic reaction, like rash; hives; itching; red, swollen, blistered, or peeling skin with or without fever; wheezing; tightness in the chest or throat; trouble breathing, swallowing, or talking; unusual hoarseness; or swelling of the mouth, face, lips, tongue, or throat.
  • Blurred eyesight.
  • Lowered interest in sex.
  • Not able to get or keep an erection.
  • Very bad dizziness or passing out.
  • Mood changes.
  • Mouth or tongue irritation.
  • Diarrhea that happens often.
  • Swelling of belly.
  • Very bad constipation.
  • Very bad belly pain.
  • Shortness of breath.
  • Trouble passing urine.
  • Stiff muscles, shakiness, or muscle movements that are not normal.
  • Seizures.
  • A burning, numbness, or tingling feeling that is not normal.

What are some other side effects of this drug?

All drugs may cause side effects. However, many people have no side effects or only have minor side effects. Call your doctor or get medical help if any of these side effects or any other side effects bother you or do not go away:

  • Constipation.
  • Dizziness.
  • Feeling sleepy.
  • Dry mouth.
  • Not hungry.
  • Upset stomach or throwing up.
  • Feeling tired or weak.

These are not all of the side effects that may occur. If you have questions about side effects, call your doctor. Call your doctor for medical advice about side effects.

You may report side effects to the FDA at 1-800-FDA-1088. You may also report side effects at http://www.fda.gov/medwatch.

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


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


Frequency not reported: Urinary retention, impotence


Frequency not reported: Blurred vision, dilated pupils


Frequency not reported: Weakness, fatigue


Frequency not reported: Interstitial pulmonary edema and fibrosis


Frequency not reported: Postural hypotension


Frequency not reported: Anorexia


Frequency not reported: Decreased libido

Editorial References and Review

Medically reviewed by BestRx Medical Team Last updated on 1/1/2020.

Source: Drugs.com Vecamyl