<p>It may cause drowsiness, dottiness and constipation. Other side effects that may occur include GIT discomfort. No apparent evidence of physical dependence of the morphine type. Other less common side effects may include transient hypertension, dry mouth, restlessness, palpitations, allergic reactions such as rashes, tightness of chest, thickening of bronchial secretions, toxic psychosis and blood dyscrasia.</p>