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Vecamyl

Generic name: mecamylamine

Last updated November 3, 2026 0 views
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What is Vecamyl?

Vecamyl is used to treat moderate to severe hypertension (high blood pressure). Due to its many side effects, this medicine is not commonly used.

Vecamyl is also used to treat malignant hypertension (extremely high blood pressure that occurs suddenly). Malignant hypertension can harm organs in the body if not treated.

Vecamyl may also be used for reasons not mentioned in this medication guide.

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How should I take Vecamyl?

Follow all directions on your prescription label and read all medication guides or instruction sheets. Your doctor may occasionally change your dose. Use the medicine exactly as directed.

Take Vecamyl after meals.

Allow for the same time interval between your meals and your Vecamyl doses. For example, if you take your medicine 15 minutes after eating, take it that way each time.

You may need different amounts of this medicine at different times of the day. Follow your doctor's dosing instructions very carefully. Do not change your dose or stop taking the medicine without your doctor's advice.

Your blood pressure will need to be checked often and you may need other medical tests.

Call your doctor at once if you have a fever, if you are sick with vomiting or diarrhea, or if you are sweating more than usual.

If you need surgery, tell your surgeon you currently use this medicine.

You should not stop using Vecamyl suddenly. Stopping suddenly may make your condition worse.

Store at room temperature away from moisture and heat.

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Warnings

Follow all instructions on your medicine label and package. Inform all your healthcare providers about your medical conditions, allergies, and all medicines you are taking.

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Before taking this medicine

You should not use Vecamyl if you are allergic to it, or if you have:

  • mild, moderate, or well-controlled hypertension;
  • severe kidney disease, or kidney failure;
  • glaucoma;
  • a blockage in your stomach or intestines;
  • poor blood flow to your heart; or
  • if you have recently had a heart attack.

Some drugs should not be used together with Vecamyl. Your doctor may change your treatment plan if you also use an antibiotic or sulfa drug.

Tell your doctor if you have ever had:

  • a heart attack or stroke;
  • coronary artery disease (clogged or hardened arteries);
  • kidney disease;
  • urination problems;
  • a chronic infection;
  • bleeding problems; or
  • if you are on a low-salt diet.

It is not known whether Vecamyl will harm an unborn baby. Tell your doctor if you are pregnant or plan to become pregnant.

You should not breastfeed while using Vecamyl.

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Vecamyl side effects

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

Vecamyl may cause serious side effects. Call your doctor right away 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 of Vecamyl 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.

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What happens if I miss a dose?

Take the medicine as soon as you remember, but skip the missed dose if it is nearly time for your next dose. Do not take two doses at once.

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What happens if I overdose?

Seek emergency medical help or call the Poison Help line at 1-800-222-1222.

Symptoms of an overdose may include dizziness, weakness, vision problems, fainting, dry mouth, nausea, vomiting, diarrhea, constipation, urination problems, anxiety, or pounding heartbeats.

Do not become overheated or dehydrated during exercise and in hot weather.

Do not drive or engage in hazardous activities until you know how Vecamyl will affect you. Your reactions may be impaired.

Do not get up too quickly from a sitting or lying position, or you may feel dizzy.

Drinking alcohol with this medicine can cause side effects.

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What other drugs will affect Vecamyl?

When you begin or stop taking Vecamyl, your doctor may need to change the doses of any other blood pressure medicines you regularly use.

Inform your doctor about all your other medicines, especially:

  • an antibiotic; or
  • a diuretic or "water pill".

This list is not complete. Other drugs may influence Vecamyl, including prescription and over-the-counter medicines, vitamins, and herbal products. Not all possible drug interactions are mentioned here.

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Related medicines

Before you take this medicine: the information on this page is general and may not cover your personal circumstances. Read the label supplied with your medicine and ask a pharmacist or doctor if you are unsure, especially if you are pregnant, breastfeeding, taking other medicines or managing a long-term condition.
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Content is provided for education and is not medical advice. See our medical disclaimer.