Seizure medications deplete body of vitamin B6 and folate. Mixing prescription antidepressants with herbal can lead to an overabundance of serotonin. Symptoms include agitation, sweating, lightheadedness, dizziness, and headaches. Garlic can lower blood pressure, with medicine, making it too low. The other herbs listed require caution when used because they could either lower or raise blood pressure.
Anticoagulants decrease the ability of platelets in the blood to form clots.
They don't dissolve formed clots, but prevent clots from growing. Clots in the blood system can cause strokes or heart attacks. Taken with the above medicines can cause potentially harmful extended bleeding, or at the least, an increase of bruising. Vitamin K causes clotting, therefore counteracts the effectiveness of the blood thinning.