Both over-the-counter and prescription allergy medications have side effects. Manufacturers are required to list them on the label, and it is up to the consumer to read the label and know what side effects are possible. Side effects can range from mild to severe and should be monitored when they occur. Severe symptoms should be reported to your physician immediately.
People with liver problems, heart and lung problems, and pregnant or nursing mothers should not take allergy medications unless under the direct supervision of a physician.
Mild Side Effects
Watery eyes, unfamiliar or bitter taste in the mouth, dry mouth, constipation and fatigue are considered mild side effects of allergy medications. In some people, the mild side effects may be moderate to severe, depending on the person. If any mild side effect becomes severe, call your physician immediately.
Moderate Side Effects
Moderate side effects include hives, itching, stinging in the nose and throat (from nasal sprays), dry mouth and nausea. Each individual may react differently, and some moderate side effects may be severe in some people. Contact your physician if the side effects start to escalate to a level that you feel you need medical attention.
Severe Side Effects
Severe side effects of allergy medications include irregular heartbeat, increased blood pressure and heartbeat, anxiety and panic attacks, and drowsiness. It is recommended by the manufacturer that you do not drive or operate heavy machinery in case drowsiness occurs.
