Tachycardia, also known as a high heart rate, is a term used to refer to a pulse rate greater than 100 beats per minute and may be a reflex when the body senses a fall in blood pressure.
Commonly some of the used medication may cause the unwanted side effect of tachycardia and low blood pressure. These may include some medicines like calcium channel blockers, diuretics, and various types of antidepressants.