Types of Bronchitis. Acute infectious bronchitis commonly accompanies or follows a URI; it develops over a couple of days, produces symptoms for 3 to 7 days, and resolves to a cough before normal respiratory function is recovered. Acute irritative bronchitis is triggered by allergies and chemical and other types of environmental irritants.
Reserve propylthiouracil use for those unable to tolerate other treatments (eg, methimazole, radioactive iodine, surgery) Propylthiouracil may be the treatment of choice during and just before the first trimester of pregnancy (strong association of methimazole with congenital malformation during first trimester)
It is also used before thyroid surgery or radioactive iodine treatment in patients who have already been treated with other medicines (e.g., methimazole) that did not work well. Propylthiouracil is an antithyroid medicine. It works by making it harder for the body to use iodine to make thyroid hormone. It does not block the effects of thyroid hormone that was made by the body before its use was begun. This medicine is available only with your doctor's prescription.