What should a patient do if they experience symptoms of an allergic reaction to INH?

A patient who experiences symptoms of an allergic reaction to isoniazid (INH) should discontinue taking the medication and seek medical attention. Allergic reactions can range from mild to severe and may include symptoms like rash, itching, swelling, difficulty breathing, or anaphylaxis. Continuing to take the medication during an allergic reaction could worsen the situation and lead to more serious health complications.

Immediate discontinuation of the medication is crucial to prevent any escalation of symptoms, especially if they include respiratory distress or swelling of the throat, which can indicate a serious condition. Seeking medical attention ensures that the patient can receive appropriate care, such as antihistamines or corticosteroids, to manage the allergic response safely.

Monitoring symptoms or consulting a pharmacist may not provide the immediate intervention necessary to address a potential allergic reaction, and waiting to see if symptoms resolve could lead to delay in treatment.