Metoprolol comes in two forms. Immediate-release tablets (metoprolol tartrate) work right away, while extended-release tablets (metoprolol succinate) work consistently over time after taking them.

Metoprolol tartrate, hydrochlorothiazide 50mg/25mg; scored tabs. The mechanism of the antihypertensive effects of beta-blocking agents has not been elucidated. However, several possible mechanisms ...