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Can I take Diazepam and Hydroxycarbamide together?

Drug interaction guide

There is no known direct interaction between diazepam and hydroxycarbamide. However, both medications can cause drowsiness or fatigue as side effects. Taking them together might make you feel more tired or less alert than usual.

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Why this happens

These drugs do not interfere with how each other is processed by the body (metabolism). Any interaction is 'pharmacodynamic', meaning their individual side effects (like sleepiness) might add together.

It is generally safe to take these together, but pay attention to how you feel. Do not drive or operate machinery until you know how this combination affects you. If you feel excessively sleepy or dizzy, speak to your doctor.

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Pregnancy and contraception

This medicine can cause severe birth defects. You must use effective contraception during treatment and for several months after stopping (3 months for women, 6 months for men). Do not handle the capsules if you are pregnant or planning to conceive.

Alcohol consumption and sedation

Do not drink alcohol while taking this medicine. It significantly increases the sedative effects, which can lead to dangerous levels of drowsiness and life-threatening breathing problems.

Infection risk (Neutropenia)

This medicine can severely lower your white blood cell count, making you very vulnerable to infections. You must seek urgent medical attention if you develop a fever, sore throat, or any other signs of infection.

Alcohol

You must avoid drinking alcohol while taking diazepam. Alcohol can dangerously increase the sedative effects of the medicine, making you very sleepy and causing breathing difficulties.

Grapefruit juice

Avoid drinking large amounts of grapefruit juice. It can increase the level of diazepam in your blood, which may increase the risk of side effects like extreme drowsiness.

Caffeine (Coffee, Tea, Energy drinks)

Caffeine can reduce the calming effects of diazepam because it acts as a stimulant, which works against the medicine's sedative properties.

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Taking multiple medicines? Our Medicines Interaction Checker helps you check whether your prescriptions, over-the-counter medicines, and supplements are safe to take together. Simply search for your medicines to see potential interactions and what to do about them.

Disclaimer

This information is for general educational purposes only and should not be relied upon as a substitute for professional medical advice. Always consult your GP, pharmacist, or another qualified healthcare professional before making decisions about your medications. Individual circumstances may vary, and only a healthcare professional who knows your medical history can provide personalised guidance.

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Article history

The information on this page is written and peer reviewed by qualified clinicians.

  • 14 Mar 2026 | Originally published
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