Zyrtec 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 that cause histamines to be 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. The active ingredient in Zyrtec is cetirizine hydrochloride.
Headaches
A potential common side effect of taking this medication is headaches as the antihistamine begins reducing symptoms. Lying down may relieve this side effect. Headaches and other common side effects tend to be short-term as the body becomes accustomed to the medication.
Sedative Effect
Another fairly common effect is a sedative effect, which can include drowsiness, dizziness and fatigue. Lying down may help. According to MedicineNet, this medication is called a "non-sedating" antihistamine. This means that Zyrtec, while possibly producing some sedative side effect, will not create sedation to the extent that other drugs of this type did in the past.
Other Side Effects
Zyrtec has the potential to cause nausea, dry mouth and a sore throat, but these symptoms are uncommon. Zyrtec can also make the patient more susceptible to sunburn. According to Drugs.com, cetirizine hydrochloride has been found in breast milk, so breast-feeding is unwise while taking this medication. Elderly individuals tend to be more sensitive to the effects of this drug, so doctors should monitor them closely. Zyrtec can also cause stomachaches and sleep problems in children.
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