A brief sudden change in a normally constant quantity: a pulse of current; a pulse of radiation. b. Any of a series of intermittent occurrences characterized by a brief sudden change in a quantity.
Some pregnant women experience a metallic taste in their mouth during the early stages of pregnancy, because of the hormone changes. It's also fairly common to crave certain foods, or go off certain foods, and have a heightened sense of smell. Learn more about the signs and symptoms of pregnancy.
Among the drugs that can cause a metallic or coppery taste in your mouth are antibiotics like Biaxin (clarithromycin); Flagyl (metronidazole) , used to treat a wide variety of infections; drugs used to treat an overactive thyroid; captopril, used to treat high blood pressure ; griseofulvin, used to treat skin infections; lithium, used in bipolar ...