An interaction can occur because one substance causes another substance to have a different effect than expected. Interactions can also occur if you have certain health conditions. »Get more ...

Drugs that target opioid receptors sometimes have severe side effects. Thousands of people around the world die every day from overdoses involving opioids such as fentanyl. An international team of ...

One in every three FDA-approved drugs targets a single superfamily of receptors dotting the surfaces of human cells. From beta blockers to antihistamines, these essential, life-saving medications ...