Condition Treated: It is used to treat high blood pressure (hypertension) and prevent angina (heart-related chest pain). It lowers blood pressure and reduces the heart's workload, which helps prevent heart attacks and strokes.
Usage: You can take it at any time of the day, but it is best to take it at the same time each day. It should be taken with food. 
Side Effects: Include fatigue, edema (swelling in the feet or ankles), sleepiness, dizziness, flushing, rashes, headache, and unusual beating of the heart (palpitations).