Can I take Promethazine and Sertraline together?

Why this happens

Both drugs have a 'sedating' effect on the brain, which adds up when taken together. Additionally, both drugs can increase levels of a chemical called serotonin; if these levels get too high, it can cause serious side effects. There is also a small risk that both drugs together can interfere with the electrical signals in your heart (QT prolongation).

What you should do

Speak to your doctor or pharmacist before combining these medicines. If you do take them together, avoid driving or using machinery until you know how they affect you. Seek medical help immediately if you experience a very fast or irregular heartbeat, severe shivering, muscle stiffness, or extreme confusion.

Using other medicines

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.