Before you begin using acetylcysteine, tell your doctor about:, All the prescription and over-the-counter medications you take, Your allergies, Your medical history and current health problems, Your pregnancy or breastfeeding status, Although it’s rare, acetylcysteine can cause a severe allergic reaction with symptoms such as rash; itching; swelling of the face, tongue, or throat; dizziness; and breathing problems. All the prescription and over-the-counter medications you take, Your allergies, Your medical history and current health problems, Your pregnancy or breastfeeding status
