All medications can cause side effects. The most common side effects include a runny nose, nausea and heartburn or vomiting. These should clear up within a few days. If they persist or get worse, you should discuss it with your healthcare provider or pharmacist.
Serious side effects include breathing disturbances, bloody sputum, fever, vomiting, and skin rashes. If you experience these then stop taking the medication and consult your doctor immediately.