It is not recommended to take allergy medicine after drinking because after drinking, especially after excessive drinking can lead to drowsiness, nausea, vomiting and other symptoms, and allergy medicine has the side effects of sedation and drowsiness, which will aggravate the symptoms of drowsiness. If the patient has vomiting symptoms at this time, it is likely to lead to accidental inhalation, so it is recommended not to take allergy medication after drinking. Drinking alcohol is also usually not recommended if one suffers from allergies, because alcohol itself is an allergen. If the body suffers from allergies, drinking alcohol may aggravate the allergy symptoms, so it is forbidden for patients with allergy symptoms to drink alcohol.