Zyrtec, the brand name for Cetirizine hydrochloride, is an antihistamine that decreases histamine in the body and treats allergy symptoms such as sneezing, runny nose and watery eyes. Allergies are reactions of the immune system where histamines are released in response to the body's detection of antigens or potentially infectious agents. Thus, an antihistamine inhibits the body's release of histamines, reducing allergy symptoms.
Drowsiness
The common side effects of taking Zyrtec usually are short-lasting as your body becomes accustomed to the medication. These effects include drowsiness, dizziness and fatigue. Lying down may reduce these symptoms.
Headaches
Another potential common side effect of taking this medication are headaches as the antihistamine begins reducing symptoms. Lying down may relieve this side effect.
Varied Effects
Zyrtec may cause side effects of increasing concern; for example, one may get sunburned more easily, thus protective clothing as well as avoiding direct sun and tanning booths, may be required. Another potential effect involves new mothers. According to Drugs.com, Cetirizine hydrochloride can be passed into breast milk so you should not breast-feed while taking this medication. Elderly individuals tend to be more sensitive to the effects of this drug and should be monitored closely, as well as young children taking this medication. Children may experience stomach aches and trouble sleeping if treated with Zyrtec.
Serious Effects
Severe reactions to Zyrtec have been documented, which include breathing difficulty, chest pain or tightness and irregular heartbeat. Other major effects sometimes are hives with itching, swelling of the face and tongue and changes in mood or mental state. Additionally, individuals have complained of dizziness and fainting and dark urine. In some cases, seizures, unusual bleeding or bruising and jaundice have been reported. If any of these side effects occur, immediate medical attention is needed.
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