Occasionally, users will exhibit side effects from Procardia. Normal side effects can include headaches, tiredness, excessive blushing, sleep troubles, strange dreams, nausea, an increase in urination, or constipation. More serious adverse reactions that should be reported to local medical staff are as follows: ankle or leg swelling, jaundice, psychosis, extreme dizziness, abnormal heartbeats, or the presence of an allergic reaction.