Dr Amir Khan has issued a warning about the potential dangers of mixing certain supplements with prescription medications. In a recent Instagram video, the ITV doctor highlighted common supplements that can interfere with drugs, urging people to always consult their doctor before combining them.
St John's Wort
St John's wort, a herbal remedy often used for mild to moderate depression, is described by Dr Khan as one of the "biggest culprits" for medication interactions. He explained that it can interfere with antidepressants, the contraceptive pill, blood thinners, and medications used after organ transplants by altering how the liver processes drugs.
Turmeric and Curcumin
Dr Khan warned against taking turmeric or curcumin supplements alongside blood thinners like warfarin, due to an increased risk of bleeding. These supplements are popular for their anti-inflammatory properties but can be dangerous when combined with anticoagulants.
Magnesium
Magnesium supplements can affect the absorption of certain antibiotics and thyroid medications, making timing crucial. Dr Khan advised patients to inform their doctor if they take magnesium to ensure proper medication scheduling.
Calcium
Calcium supplements can reduce the absorption of levothyroxine and some antibiotics if taken together. Dr Khan emphasised the importance of discussing calcium intake with a healthcare provider.
Vitamin K
Vitamin K, essential for bone health, can interfere with warfarin by affecting vitamin K pathways, which may alter bleeding and clotting risks. Patients on warfarin should be cautious with vitamin K supplements.
Grapefruit Juice
While not a supplement, grapefruit juice can interact with statins and other medications by affecting drug breakdown. Dr Khan advised avoiding grapefruit juice when taking certain drugs.
Dr Khan concluded: "Supplements aren't bad—some are genuinely helpful. But if you're on regular medication, tell your doctor which supplements you take. Interactions can happen between medicine and something you thought was harmless."
