12 Medications You Should Never Mix Without Asking Your Doctor
11. Anticoagulants and Herbal Supplements

Many herbal supplements, including ginkgo biloba, garlic, and ginger, have natural blood-thinning effects. When combined with prescription anticoagulants like warfarin or apixaban, this can increase the risk of dangerous bleeding. Always check with your doctor before taking herbal supplements if you're on a blood thinner.
12. Anti-Seizure Medications and Birth Control

Anti-seizure medications like carbamazepine (Tegretol) and phenytoin (Dilantin) can reduce the effectiveness of birth control pills, increasing the risk of unintended pregnancy. If you're taking these medications, talk to your doctor about alternative contraception options, such as an intrauterine device (IUD) or a higher-dose birth control pill.