"Despite having normal blood levels of thyroid-stimulating hormone (TSH), many patients treated for hypothyroidism with levothyroxine (L-T4) continue to have symptoms, including fatigue as well as a higher body mass index (BMI) and a greater likel"...
Major adverse reactions (much less common than the minor adverse reactions) include inhibition of myelopoiesis (agranulocytosis, granulopenia, and thrombo-cytopenia), aplastic anemia, drug fever, a lupus-like syndrome including solenomegaly, hepatitis, periartentis, and hypoprothrombinemia and bleeding. Nephritis, glomerulonephritis, interstitial pneumonitis, exfoliative dermatitis, and erythema nodosum have been reported. Reports of a vasculitic syndrome associated with the presence of anti-neutrophilic cytoplasmic antibodies (ANCA) have also been received. Manifestations of ANCA-positive vasculitis may include rapidly progressive glomerulonephritis (crescentic and pauci-immune necrotizing glomerulonephritis) sometimes leading to acute renal failure; fever; pulmonary infiltrates or alveolar hemorrhage; skin ulcers; and leucocytoclastic vasculitis.
Minor adverse reactions include skin rash, urticaria, nausea, vomiting, epigastric distress, arthralgia, paresthesias, loss of taste, abnormal Ioss of hair, myalgia, headache, pruritus, drowsiness, neuritis, edema, vertigo, skin pigmentation, jaundice, sialadenopathy, lymphadenopathy, vasculitis, glomerulonephritis, and taste perversion.
Read the Propylthiouracil (propylthiouracil tablet) Side Effects Center for a complete guide to possible side effects
The activity of anticoagulants may be potentiated by anti-vitamin-K activity attributed to propylthiouracil (propylthiouracil (propylthiouracil (propylthiouracil tablet) tablet) tablet) .
β-Adrenergic blocking agents
Hyperthyroidism may cause an increased clearance of beta blockers with a high extraction ratio. A dose reduction of beta-adrenergic blockers may be needed when a hyperthyroid patient becomes euthyroid.
Serum digitalis levels may be increased when hyperthyroid patients on a stable digitalis glycoside regimen become euthyroid; a reduced dosage of digitalis glycosides may be required.
Theophylline clearance may decrease when hyperthyroid patients on a stable theophylline regimen become euthyroid; a reduced dose of theophylline may be needed.This monograph has been modified to include the generic and brand name in many instances.
Last reviewed on RxList: 1/25/2010
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