Can I take Venlafaxine and Vitamin D together?

Why this happens

Venlafaxine (an antidepressant) and vitamin D (a fat-soluble vitamin) are processed by different pathways in the body and do not interfere with how the other works.

What you should do

You can continue taking both as prescribed or recommended. As with any supplement, it is always a good idea to let your doctor or pharmacist know what you are taking.

Important precautions

Depression and anxiety disorders

Venlafaxine can cause an increase in suicidal thoughts or self-harm, particularly when first starting treatment or changing doses. Monitor your mood closely and seek urgent medical help if you notice any distressing changes.

Bleeding disorders

Venlafaxine can increase your risk of bleeding, especially if you are also taking aspirin, NSAIDs (like ibuprofen), or blood-thinning medicines like warfarin. Seek medical advice if you notice unusual bruising or bleeding.

Serotonin Syndrome

Combining venlafaxine with other medicines that affect serotonin (such as St John's Wort or certain painkillers) can cause a life-threatening condition called serotonin syndrome. Symptoms include agitation, hallucinations, fast heartbeat, and muscle stiffness.

Hypercalcaemia (high blood calcium)

Do not take vitamin D if you have high levels of calcium in your blood or urine, as it can lead to serious kidney damage and heart rhythm problems.

Food and drink warnings

Alcohol

It is best to avoid or strictly limit alcohol while taking venlafaxine. Combining alcohol with this medicine can increase drowsiness, dizziness, and the risk of coordination problems. It may also worsen the symptoms of your underlying condition.

Caffeine

Venlafaxine can sometimes increase your blood pressure or heart rate. Consuming high amounts of caffeine (found in coffee, tea, and energy drinks) may worsen these effects or increase feelings of anxiety and restlessness.

High-fat meals

Vitamin D is a fat-soluble vitamin. It is best absorbed by your body when taken with a meal that contains some fat (such as eggs, avocado, nuts, or dairy).

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.