Along with its needing effects, a drug may cause some unwanted effects. Although not all of these side effects may occur, if they do occur they may need medical attention.
Check with your family doctor as soon as possible if any of the following side effects was happen
More common
Dizziness or lightheadedness
Less common
Dizziness or lightheadedness when getting up from a lying or sitting position; fainting - sudden; fast and pounding heartbeat; irregular heartbeat; shortness of breath; swelling of feet or lower legs
Rare
Painful or prolonged erection of the penis - called priapism, although extremely rare, must have immediate medical attention. If painful or prolonged erection occurs, call your family doctor or go to an emergency room as soon as possibleMore common side effects may occur that usually don't needed medical attention. These side effects may go away during treat as your body adjusts to the drug. However, check with your family doctor if any of the following side effects continue or are bothersome:
More common
Headache; unusual tiredness
Less common
Nausea; nervousness, restlessness, unusual irritability; runny nose; sleepiness or drowsiness
More common side effects not listed above may also occur in some diseaseds. If you have any other problems, check with your family doctor.