Over-the-counter Claritin is used to treat common seasonal allergies, such as sneezing, a runny nose and watery eyes, according to Drugs.com. Claritin uses loratadine as its active ingredient. Loratadine is a nonsedating antihistamine that works by blocking the body's ability to produce histamine. Histamine is the hormone in the body that causes most allergy symptoms. Though Claritin is effective at reducing seasonal allergy symptoms, when used as directed, it may not be for everyone. Most healthy adults do not experience serious side effects from over-the-counter Claritin.
Allergic Reaction
As with any medication, OTC Claritin may cause an allergic reaction in some people. According to MedlinePlus, the first time a user takes Claritin, she may not experience any allergic reactions. During the first dose, the body is building up a resistance to the drug, producing antibodies to attack the drug the next time it enters the body. During subsequent use, the body will release the antibodies that will cause an allergic reaction. These symptoms include difficulty breathing, hives or swelling in the face, tongue or lips, according to Drugs.com. If a patient experiences these symptoms, she should discontinue use of the drug and talk with a doctor.
Serious Side Effects
Serious side effects of taking over-the-counter Claritin are a fast heart rate, seizures, lightheadedness and jaundice, according to Drugs.com. These side effects are a sign that the drug is not effective in the person's body and he should discontinue use. If someone experiences these symptoms, he should get immediate medical attention. Drugwatch.com states that in rare cases Claritin can cause anaphylactic shock, a rare allergic condition. This condition is life-threatening and will need immediate medical attention. Common symptoms of anaphylactic shock include fainting, mental confusion and a faint pulse.
Common Side Effects
According to Drugs.com, common side effects while taking OTC Claritin are headache, drowsiness, diarrhea, nervousness, dry mouth, blurred vision, nosebleeds or a skin rash. If a user experiences any of these symptoms, he may want to consider using a different drug. Any side effect from taking Claritin should be discussed with a physician. Do not take more than the recommended dose of Claritin because taking too much can cause adverse side effects.
"D" Side Effects
If someone purchases Claritin D, they may experience certain side effects, according to Drugs.com. Claritin D combines loratadine with a decongestant, pseudoephedrine. Pseudoephedrine can cause the user to feel nervous, excited and awake. This drug should not be taken by someone with heart disease because it can cause the heart to race.
