Side effects of Coreg include lightheadedness, dizziness, diarrhea, drowsiness and impotence, according to WebMD. Other side effects are reduced blood supply to feet and hands, which causes a feeling of coldness.
The medication treats heart failure, high blood pressure and complications resulting from a heart attack, says Rx List. Severe side effects that require immediate medical attention include uneven heartbeats, difficulty breathing, chest tightness, inflammation and rapid weight gain. Patients should also consult a doctor when symptoms such as fever, skin rash, pale skin, and blurred vision occur. Additionally, Coreg reduces sex drive and makes it difficult to have an orgasm. Dizziness mostly occurs within an hour of taking this drug. Take Coreg with food, starting with a small dose and slowly increasing the dose to decrease the risk of getting dizzy.
Patients should disclose any medical history of irregular heartbeats, sick sinus syndrome, asthma, chronic bronchitis and blood circulation issues such as peripheral vascular disease, states WebMD. Some severe allergic reactions to Coreg require epinephrine. Patients should avoid tasks that require alertness when the doctor increases the dosage. Individuals with diabetes should note that Coreg prevents the fast heartbeat that notifies diabetic patients when blood sugar levels fall too low. It is unsafe to take Coreg during pregnancy, and breastfeeding mothers should consult a doctor before taking it..