There are many important metoprolol warnings and precautions to be aware of before starting treatment, including potential side effects to look out for and certain people who should not take the medication. Metoprolol is not suitable for everyone and should not be taken by those who have serious congestive heart failure, are allergic to any components of the medicine, or have certain types of irregular heart rhythms.
Any allergies, including allergies to other beta blockers, foods, dyes, or preservatives.
Also, let your healthcare provider know if you:
Are pregnant or trying to become pregnant
Are breastfeeding
Will be undergoing surgery or anesthesia.
Tell your healthcare provider about all other medicines that you may currently be taking, including prescription and non-prescription medicines, antacids, vitamins, and herbal supplements.