Propafenone helps control irregular heart rhythms by blocking certain electrical signals. Learn how it works, who can use it safely, and what side effects to expect.
Most body twitches are harmless and tied to caffeine, sleep, or low magnesium. Learn what causes them and which signs are worth discussing with a doctor.
Novocaine blocks pain by numbing nerves, but most dentists now prefer lidocaine. Learn how it works, its side effects, and where it's still used today.