Loratadine, which is a commonly prescribed and over-the-counter antihistamine, is generally considered to be safe if used as directed. While it is uncommon to experience severe side effects while taking this drug, reactions can occur in some individuals. The most notable side effects are dry mouth and excessive thirst. In taking a sustained-release form of his drug, side effects of loratadine may not occur for several hours after the initial dose. Some individuals may also experience headaches or digestive problems ,such as nausea or more rarely, allergic reactions.

Individuals who have known sensitivity to loratadine or who have experienced allergic reactions to loratadine in the past should not use this drug. Side effects of loratadine rarely include life-threatening allergic reactions, although cases have been reported. This is why it is vital to receive prompt medical attention if experiencing any signs of an allergic reaction after using this drug.

Some of the most prominent signs of an allergic reaction to loratadine include rash or hives. Shortness of breath may also occur in an individual experiencing an allergic reaction to loratadine. Some individuals may also experience swelling of the lips and tongue, which can be life threatening if not treated promptly.

Loratadine is commonly used for hay fever and seasonal allergies. It is considered to be a non-drowsy antihistamine when used as directed. Loratadine is commonly marketed under the brand name of Claritin® although generic brands are commonly distributed as well.

Other known side effects of loratadine are cough and sore throat. These symptoms are generally mild and may not disappear after a few days of using loratadine. Although uncommon, a fast or irregular heartbeat may be other side effects of loratadine. Typically, this may occur if high doses are taken for a long period of time.

Drowsiness may be one of the side effects of loratadine as well. Excessive sleepiness generally occurs in individuals who take more than the recommended dosage of loratadine. Difficulty concentrating is another complaint in some individuals who have used loratadine. While motor skill impairment is an uncommon side effect, anyone experiencing confusion or extreme drowsiness while using loratadine should not operate machinery or drive a car.

Other side effects of loratadine include high blood pressure, otherwise known as hypertension. Hypotension, which is commonly referred to as low blood pressure, may be another side effect of loratadine. Inflammation of the liver is a very rare side effect of loratadine, having only been reported in two cases.