- heart failure
- irregular heartbeats
- kidney failure
- lung disease
- some heart diseases
- cimetidine
- antacids
- antibiotics
- thyroid replacement drugs
- diazepam
- verapamil
- quinidine
- irregular heartbeat
- lethargy
- seizures
- diarrhea
- loss of appetite
- vomiting
- breathing difficulties
- facial swelling
- hives
- fainting
- disorientation
- irregular heartbeat