Drug interactions
Penicillamine + Vitamin B6
Severity: Moderate
Penicillamine and Vitamin B6: 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
Penicillamine acts as a pyridoxine antagonist and can lower B6 status, which over long-term therapy may cause deficiency, including neuropathy. Supplementation is commonly given to patients on chronic penicillamine.
What this interaction means in plain words
Penicillamine and Vitamin B6 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.
Penicillamine belongs to Musculoskeletal; Vitamin B6 belongs to Gastrointestinal Tract.
Why it happens
Penicillamine reacts with pyridoxal and pyridoxal phosphate, forming inactive complexes and increasing B6 requirements.
What to do
Give pyridoxine supplementation during long-term penicillamine therapy, as is commonly recommended in labeling for Wilson disease and cystinuria. Monitor for signs of peripheral neuropathy.
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 B6
- Ethotoin + Vitamin B6 Moderate
- Fosphenytoin + Vitamin B6 Moderate
- Isoniazid + Vitamin B6 Moderate
- Levodopa + Vitamin B6 Moderate
- Phenobarbital + Vitamin B6 Moderate
- Phenytoin + Vitamin B6 Moderate
Other interactions of Penicillamine
- Gold sodium thiomalate + Penicillamine Major
- Aluminum hydroxide + Penicillamine Moderate
- Calcium carbonate + Penicillamine Moderate
- Calcium + Penicillamine Moderate
- Carbonyl iron + Penicillamine Moderate
- Copper + Penicillamine Moderate
Frequently asked questions
Can I take Penicillamine with Vitamin B6?
MediHelp rates the interaction as moderate. Penicillamine and Vitamin B6 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. Penicillamine acts as a pyridoxine antagonist and can lower B6 status, which over long-term therapy may cause deficiency, including neuropathy. Supplementation is commonly given to patients on chronic penicillamine.
How serious is the interaction between Penicillamine and Vitamin B6?
MediHelp rates it moderate, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Give pyridoxine supplementation during long-term penicillamine therapy, as is commonly recommended in labeling for Wilson disease and cystinuria. Monitor for signs of peripheral neuropathy.
What other medicines interact with Vitamin B6?
MediHelp also lists interactions of Vitamin B6 with, for example, Ethotoin, Fosphenytoin, Isoniazid. The full list is on the Vitamin B6 page.
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