Despite needing FDA clearance to be on the shelves of your local pharmacy, some popular medicines probably don't work.

Additive effects with other antihistamines, anticholinergics, sedatives, tranquilizers or other nighttime cold/fu products (eg, NyQuil); avoid.

Acetaminophen 325mg, doxylamine succinate 6.25mg, dextromethorphan HBr 15mg; per liquiCap. See Contraindications. Hypertensive crisis with MAOIs. Increased risk of hepatotoxicity with ≥3 ...

It works by altering the levels of certain chemical messengers called neurotransmitters in your brain — in particular, serotonin and dopamine. Although it has a sedative effect, quetiapine isn ...