Clinical reasons for allergic cough to remain after taking anti-allergic drugs include insufficient dosage, inaccurate dosage, and the presence of allergens. 1. Insufficient dosage: drugs need to be taken in effective doses to achieve the corresponding effective concentration, when the dosage is insufficient, the drugs are unable to play an effective pharmacological role in the body, and thus the symptoms of the disease may still be present after taking the drugs. 2. Inaccurate use of medication: Although some allergic coughs are directly related to allergies and allergens, when they are triggered by upper respiratory tract infections, the use of anti-allergic drugs alone will not be able to play a role, but also need to add other drugs, such as the antibiotic amoxicillin, in order to control the infection. 3. Allergens still exist: the treatment of allergies is important to get rid of allergens, such as the environment in the pollen, willow or animal hair, etc., suffering from the disease of the people did not get rid of the allergic environment, may cause allergic symptoms, or the use of medication may be ineffective, and therefore need to first get rid of allergens. Inhalation of hormones such as budesonide may also be needed. Allergic cough after taking anti-allergy drugs still cough, it is recommended to actively seek medical attention, clear cause for targeted treatment.