Drug allergy is a very common complication during treatment, with diverse clinical manifestations, including lesions on the skin, mucous membranes and internal organs. All drugs can cause allergic reactions, however, the most common drug allergies are antibiotics, anticonvulsants, non-steroidal anti-inflammatory drugs and gout medications, which have the highest incidence of causing allergic reactions.

Antibiotics are the most commonly prescribed medications in children and are also the ones with the most adverse reactions, with about 25% of children having allergic reactions to antibiotics. Although these illnesses are usually not severe enough to require hospitalization,

Expectorants are drugs that thin mucus, reducing the thickness of phlegm and mucus, making it easier to cough up and expel mucus from the respiratory tract. However, because expectorants can cause some adverse reactions, special caution should be exercised when using them, especially with children.