Chlor-Trimeton is an over-the-counter allergy medication that contains the active ingredient chlorpheniramine, a type of antihistamine. Treatment with this medication interferes with how histamine, an allergy-inducing substance, works within a patient's body. Patients should be aware of Chlor-Trimeton side effects before beginning treatment with this medication.
Dry Mouth or Upset Stomach
While receiving treatment with Chlor-Trimeton, patients can experience dry mouth or upset stomach side effects, Drugs.com reports. Dry mouth symptoms can include throat irritation, thick saliva or increased thirst. Stomach irritation can induce nausea or vomiting, which may lead to a temporary decrease in appetite. Certain patients also experience constipation, a side effect characterized by hard, infrequent or absent bowel movements.
Blurred Vision, Dizziness or Headache
Vision alterations, including blurred or cloudy vision, can arise during treatment with Chlor-Trimeton. Such side effects are serious and affected patients should contact a doctor immediately, PubMed Health advises. Vision changes can contribute to headache pain or episodes of dizziness in certain patients. Headache or dizziness can cause patients to appear unusually confused or unbalanced while walking or standing. Patients who develop severe or persistent dizziness should consult a physician.
Excitability or Concentration Problems
Children who take this antihistamine medication can become unusually excited or hyper as a side effect of treatment, KidsHealth warns. Young patients may also have difficulty concentrating while at home or school while receiving treatment with Chlor-Trimeton. These side effects can contribute to sleeping difficulties in certain children.
Drowsiness
Increased drowsiness can develop as a side effect of Chlor-Trimeton in certain people. Sensations of sleepiness can occur shortly after treatment and may cause patients to fall asleep or take a nap. Drowsiness or fatigue can also contribute to difficulty concentrating.
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