Along with its needing effects, a drug may cause some unwanted effects. Although not all of these side effects may occur, if they do occur they may need medical attention.
Check with your family doctor immediately if the following side effect occurs:
Less common or rare
Note:Less frequent or rare with azatadine, cetirizine, clemastine, cyproheptadine, desloratadine, dexchlorpheniramine, diphenhydramine, or loratadine
Fast or irregular heartbeat; fever; abdominal or stomach pain; burning; chills; clay-colored stools or dark urine; cough; diarrhea; difficulty swallowing; dizziness; fast heartbeat; fever; headache; hives; itching; prickly sensations; puffiness or swelling of the eyelids or around the eyes, face, lips or tongue; redness of skin; seizures; shortness of breath; skin rash; swelling; tightness in chest; tingling; unusual tiredness or weakness; wheezing
Always check with your family doctor as soon as possible if any of the following side effects was happen
Less common or rare
Sore throat; unusual bleeding or bruising; unusual tiredness or weakness
Symptoms of overdose
Clumsiness or unsteadiness; convulsions - seizures; drowsiness - severe; dryness of mouth, nose, or throat - severe; feeling faint; flushing or redness of face; hallucinations - seeing, hearing, or feeling things that are not there; shortness of breath or troubled breathing; trouble in sleeping
Other side effects may occur that usually don't needed medical attention. These side effects may go away during treat as your body adjusts to the drug. However, check with your health care professional if any of the following side effects continue or are bothersome:
More common
Drowsiness; dry mouth, nose, or throat; gastrointestinal upset, stomach pain, or nausea; headache; increased appetite and weight gain; thickening of mucus
Less common or rare
Acid or sour stomach; belching; blurred vision or any change in vision; clumsiness or unsteadiness; body aches or pain; confusion - not with diphenhydramine; congestion; constipation; cough; diarrhea; difficult or painful urination; difficulty in moving; difficult or painful menstruation; dizziness - not with brompheniramine or hydroxyzine; drowsiness - with high doses of desloratadine and loratadine; dryness of mouth, nose, or throat; early menstruation; fast heartbeat; fatigue; fever; gastrointestinal upset, stomach pain or nausea; heartburn; hoarseness; increased appetite and weight gain; increased sensitivity of skin to sun; increased sweating; indigestion; loss of appetite; joint pain; muscle aching or cramping; muscle pains or stiffness; nausea; nightmares - not with azatadine, chlorpheniramine, cyproheptadine, desloratadine, hydroxyzine, or loratadine; ringing or buzzing in ears; runny nose; skin rash; swollen joints; stomach discomfort, upset or pain; tender swollen glands in neck; thickening of mucus; tremor; unusual excitement, nervousness, restlessness, or irritability; vomiting
More common side effects not listed above may also occur in some diseaseds. If you notice any other problems, check with your health care professional.