These medicines can be prescribed by your healthcare provider or purchased over the counter (OTC). Read on for more details.

Over-the-counter antihistamines were among the most common substances involved in these adverse events, along with prescription antidepressants, painkillers and illegal synthetic cannabinoids.

This histamine blocker can also help you fall asleep and stay asleep when you take it 30 minutes before bed. It is a key ingredient in many over-the-counter drugstore sleep aids that can be used ...

You can purchase most antihistamines over-the-counter (OTC), meaning you do not need a prescription. Most are taken in pill ...

A decade after UC San Francisco scientists identified an over-the-counter antihistamine as a treatment for multiple sclerosis, researchers have developed an approach to measure the drug's ...