It seems you had Mitral Regurgitation of Rheumatic origin for which MV repair has been done.
) is a Beta Blocker and has been given to keep your heart rate under control.
) is an ARB which has apparently been given to augment cardiac remodelling and for avoiding Heart Failure.
Pentids, an antibiotic (not Penis), 400 mg twice a day has been given to you to prevent infections (like those of throat, tonsils, etc.) which could lead to re-activation of Rheumatic activity, which occur as body's immune response after such trivial infections. Alternatively, you could have been prescribed 3-4 weekly injections of Long Acting Penicillin (Penidure
I hope this satisfies your querries.
Wish you all the best.