Metoprolol

Common Side Effects
Drowsiness
Dizziness
Tiredness
Diarrhea
Slow heartbeat may occur
Decreased sexual ability has been reported infrequently

Serious Side Effects
very slow heartbeat
Severe dizziness
Fainting
Blue fingers/toes
Trouble breathing
New or worsening symptoms of heart failure (such as swelling ankles/feet Severe tiredness
Shortness of breath
Unexplained/sudden weight gain
Mental/mood changes (such as confusion, mood swings, depression)

Very Serious Allergic Reactions Is Rare
Rash
Itching/swelling (especially of the face/tongue/throat)
Severe dizziness
Trouble breathing