Procardia xl or nifedipine may have side effects such as headache, dizziness, drowsiness, tired feeling, sleep problems, mild rash or itching
, nausea, diarrhea, mild constipation or stomach pain. It can also cause more serious side effects such as fast heart rate, numbness and even chest pains which warrants immediate medical attention. If these symptoms persist, it is best that you have this evaluated by your doctor for proper management. Take care and do keep us posted.