Drug interactions
Mecamylamine + Vitamin b3
Severity: Moderate
Mecamylamine and Vitamin b3: moderate interaction.
Last updated
For healthcare professionals — reference only. This page is a brief summary, not medical advice and not a substitute for official labeling or clinical judgement. Always verify before prescribing or dispensing.
Summary
Niacin causes vasodilation and flushing and can lower blood pressure, while mecamylamine is a ganglionic blocker that causes substantial hypotension, especially orthostatic. Together the hypotensive effects may be additive, with dizziness or fainting.
What this interaction means in plain words
Mecamylamine and Vitamin b3 can affect each other. The combination is often manageable, but it may need a change of dose, a change of timing, or extra checks while both are taken.
Mecamylamine belongs to Cardiovascular; Vitamin b3 belongs to Gastrointestinal Tract.
Why it happens
Additive hypotensive effects from niacin-induced vasodilation and ganglionic blockade by mecamylamine.
What to do
Monitor blood pressure, including standing readings, when starting or raising niacin doses. Advise patients to rise slowly and reduce doses if symptomatic hypotension occurs.
What to ask your pharmacist
- Should I take them at different times of day?
- Does the dose of either medicine need to change?
- Is there anything I should avoid, such as alcohol or certain foods, while on both?
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Other interactions of Vitamin b3
- Lovastatin + Vitamin b3 Major
- Simvastatin + Vitamin b3 Major
- Atorvastatin + Vitamin b3 Moderate
- Cholestyramine + Vitamin b3 Moderate
- Colestipol + Vitamin b3 Moderate
- Fluvastatin + Vitamin b3 Moderate
Other interactions of Mecamylamine
- Lofexidine + Mecamylamine Major
- Bethanechol + Mecamylamine Moderate
- Mecamylamine + Niacin Moderate
- Mecamylamine + Tizanidine Moderate
Frequently asked questions
Can I take Mecamylamine with Vitamin b3?
MediHelp rates the interaction as moderate. Mecamylamine and Vitamin b3 can affect each other. The combination is often manageable, but it may need a change of dose, a change of timing, or extra checks while both are taken. Niacin causes vasodilation and flushing and can lower blood pressure, while mecamylamine is a ganglionic blocker that causes substantial hypotension, especially orthostatic. Together the hypotensive effects may be additive, with dizziness or fainting.
How serious is the interaction between Mecamylamine and Vitamin b3?
MediHelp rates it moderate, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Monitor blood pressure, including standing readings, when starting or raising niacin doses. Advise patients to rise slowly and reduce doses if symptomatic hypotension occurs.
What other medicines interact with Vitamin b3?
MediHelp also lists interactions of Vitamin b3 with, for example, Lovastatin, Simvastatin, Atorvastatin. The full list is on the Vitamin b3 page.
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