Allergy-D is a medication used to manage such allergy symptoms as a runny nose, sneezing, watery and itchy eyes. This medication is a combination of the drugs cetirizine and pseudoephedrine. According to Drugs.com, cetirizine is an antihistamine medication that prevents specialized cells, called mast cells, from releasing histamine. Pseudoephedrine is a decongestant medication that constricts your nasal blood vessels. Typically, your doctor will prescribe one tablet every 12 hours.
Common Side Effects
According to Drugs.com, Allergy-D typically causes dry mouth, constipation, nausea and difficulty concentrating. Drink prune juice and eat whole-bran cereal and breads to add plenty of fiber to your diet. This should help regulate your bowel movements. Allergy-D can also cause drowsiness and tinnitus (ringing in your ears). Do not drive your car or operate any machinery that requires you to be fully awake. Allergy-D's common side effects should resolve on their own within three to four days. Discontinue Allergy-D if they do not resolve, and call your physician or pharmacist to obtain advice on another anti-allergy medication.
Serious Side Effects
According to the Mayo Clinic, Allergy-D's rare but serious side effects include trouble breathing, rapid weight gain, blurry vision, and abnormal bleeding or bruising. Thrombocytopenia, a blood disorder of low platelet counts, is to blame for easy bleeding and bruising. Your blood contains platelets that are responsible for clotting. Without them, you can bleed profusely. Allergy-D can also cause epistaxis (nosebleeds), bleeding gums, hemoptysis (vomiting blood) and melena (black stools). Melena is typically a sign of upper gastrointestinal bleeding (of the small intestines). Allergy-D's other serious side effects include a skin rash, sweating, jaundice and elevated blood pressure (hypertension). Jaundice refers to a medical condition in which your skin and the white parts of your eyes turn yellow. It can be a harbinger of liver damage. Signs of hypertension (high blood pressure) include a headache, nausea, vomiting, tachycardia (fast heartbeat) and sweating. Call your doctor if Allergy-D causes these serious effects.
Other Concerns
Inform your physician if you have diabetes, glaucoma, high blood pressure, difficulty urinating and heart or thyroid disease. Allergy-D may exacerbate these medical conditions. Avoid this medication if you are taking monoamine oxidase inhibitors (MAOIs), such as rasagaline or phenilzine. Allergy-D can interact with these drugs and cause the aforementioned side effects. Allergy-D can pass into breast milk. Inform your doctor if you are nursing your baby.
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