<p>Mild side effects include-Nausea, Vomiting, Diarrhea, Cramp, Tiredness, Weakness, Confusion. These side effects disappear when the dose is reduced or treatment is discontinued. Serious side effects include low blood pressure, changes in the recording of the heart&#39;s electrical activity (ECG), depression, severe allergic reaction (e.g. swelling in mouth and throat, itching, rash, redness), respiratory depression, coma. These may require emergency medical treatment. These serious side efects occur very rarely.</p>