People are buying herbal remedies for everything from migraines to memory preservation to depression. Where once you had to see an herbalist or naturopath to get the daily dose of herbs for what ails you, herbal products are now widely available in drugstores and health food stores, making the ability to self-medicate greater than ever. But with opportunity comes a warning: mixing herbal remedies and prescription drugs could be harmful to your health. Just like drug-drug and drug-food interactions, herb-drug interactions are very common. Some herbal medicines may cancel the effect of a prescription drug, while others may reduce or exaggerate it.