Winstrol Side Effects
Generic Name: stanozolol
Note: This page contains side effects data for the generic drug stanozolol. It is possible that some of the dosage forms included below may not apply to the brand name Winstrol.
For the Consumer
Applies to stanozolol: oral tablet
In rare cases, serious and even fatal cases of liver problems have developed during treatment with stanozolol (the active ingredient contained in Winstrol) Contact your doctor immediately if you experience abdominal pain, light colored stools, dark colored urine, unusual fatigue, nausea or vomiting, or yellowing of the skin or eyes. These may be early signs of liver problems.
If you experience any of the following serious side effects, contact your doctor immediately or seek emergency medical attention:
an allergic reaction (difficulty breathing; closing of the throat; swelling of the lips, tongue, or face; or hives);
swelling of the arms or legs (especially ankles);
frequent or persistent erections, or breast tenderness or enlargement (male patients); or
voice changes (hoarseness, deepening), hair loss, facial hair growth, clitoral enlargement, or menstrual irregularities (female patients).
Other less serious side effects may also occur. Talk to your doctor if you experience
new or worsening acne;
changes in sexual desire.
Side effects other than those listed here may also occur. Talk to your doctor about any side effect that seems unusual or that is especially bothersome.
For Healthcare Professionals
Applies to stanozolol: oral tablet
Cardiovascular effects may be precipitated in patients adversely affected by fluid retention. Edema, with and without congestive heart failure, has occurred during anabolic steroid therapy.[Ref]
Genitourinary effect following chronic administration and/or large dosages of anabolic steroids can result in oligospermia and decreased ejaculatory volume. Elderly male patients may experience prostatic enlargement resulting in urinary obstruction. Priapism and excessive stimulation may develop.
In female patients the use of anabolic steroids may result in virilization including deepening voice, hirsutism, acne, clitomegaly (not reversible), and menstrual abnormalities. Discontinuation of medication at signs of mild virilization may prevent irreversible virilization.
Alterations in libido may occur (increased/decreased).[Ref]
Life-threatening peliosis hepatis and hepatic abnormalities including hepatic neoplasms and hepatocellular carcinomas have occurred following prolonged therapy with high doses of anabolic steroids. Tumor regression did not occur in all cases following medication withdrawal.
Cholestatic hepatitis, jaundice, and abnormal liver function tests occur at relatively low doses.[Ref]
In female patients the use of anabolic steroids has resulted in virilization including deepening voice, hirsutism, acne, clitomegaly (not reversible), and menstrual abnormalities. Discontinuation of stanozolol (the active ingredient contained in Winstrol) at signs of mild virilization may prevent irreversible virilization.[Ref]
Androgenic activity associated with anabolic steroids is involved in termination of linear bone growth by closure of the epiphyseal growth centers. Appropriate monitoring of bone age is recommended during stanozolol (the active ingredient contained in Winstrol) use in prepubertal patients.[Ref]
Oncologic effects following prolonged therapy with large doses of anabolic steroids have included hepatic neoplasms and hepatocellular carcinomas.[Ref]
Hematologic effects occurring during anabolic steroid therapy include alteration in clotting factors II, V, VII and X , prolonged prothrombin time (PT), and increased red cell production.[Ref]
During exogenous administration of anabolic steroids, endogenous testosterone release is inhibited through feedback inhibition of pituitary luteinizing hormone (LH). Large doses of exogenous anabolic steroids may suppress spermatogenesis through inhibition of pituitary follicle stimulating hormone (FSH).
Decreased glucose tolerance requiring adjustments in hyperglycemic control has occurred in diabetic patients during anabolic steroid therapy.[Ref]
Metabolic effects occurring during anabolic steroid therapy in immobilized patients or those with metastatic breast disease include osteolytic-induced hypercalcemia.
Anabolic steroids effect electrolyte balance, nitrogen retention, and urinary calcium excretion. Edema, with and without congestive heart failure, has occurred during anabolic steroid therapy.
The androgenic activity of anabolic steroids may decrease levels of thyroxin-binding globulin, resulting in decreased total T4 serum levels and increased resin uptake of T3 and T4. Free thyroid hormone levels remain unchanged, however, and there is no clinical evidence of thyroid dysfunction.
Significant increases in low density lipoproteins (LDL) and decreases in high density lipoproteins (HDL) have occurred.[Ref]
Anabolic steroids cause retention of nitrogen, sodium, potassium, chloride, water and phosphorus, and decrease urinary excretion of calcium. Patients should be instructed to report edema.[Ref]
Gastrointestinal effects occurring during stanozolol (the active ingredient contained in Winstrol) therapy include nausea and vomiting.[Ref]
1. "Product Information. Winstrol (stanozolol)." Sanofi Winthrop Pharmaceuticals, New York, NY.
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5. Sheffer AL, Fearon DT, Austen KF "Hereditary angioedema: a decade of management with stanozolol [published erratum appears in J Allergy Clin Immunol 1988 Jun;81(6):1208." J Allergy Clin Immunol 80 (1987): 855-60
6. Hollard D, Sotto JJ, Berthier R, Leger J, Michallet M "High rate of long-term survivals in AML treated by chemotherapy and androgenotherapy: a pilot study." Cancer 45 (1980): 1540-8
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9. Evely RS, Triger DR, Milnes JP, Low-Beer TS, Williams R "Severe cholestasis associated with stanozolol." Br Med J (Clin Res Ed) 294 (1987): 612-3
10. Falk H, Thomas LB, Popper H, Ishak KG "Hepatic angiosarcoma associated with androgenic-anabolic steroids." Lancet 2 (1979): 1120-3
11. Belch JJ, Madhok R, McArdle B, McLaughlin K, Kluft C, Forbes CD, Sturrock RD "The effect of increasing fibrinolysis in patients with rheumatoid arthritis: a double blind study of stanozolol." Q J Med 58 (1986): 19-27
12. Chesnut CH 3d, Ivey JL, Gruber HE, Matthews M, Nelp WB, Sisom K, Baylink DJ "Stanozolol in postmenopausal osteoporosis: therapeutic efficacy and possible mechanisms of action." Metabolism 32 (1983): 571-80
13. Liow RY, Tavares S "Bilateral rupture of the quadriceps tendon associated with anabolic steroids." Br J Sports Med 29 (1995): 77-9
14. Abu-Shakra S, Alhalabi MS, Nachtman FC, Schemidt RA, Brusilow WS "Anabolic steroids induce injury and apoptosis of differentiated skeletal muscle." J Neurosci Res 47 (1997): 186-97
15. Rosnick MJ "Use of anabolic steroid, stanozolol, to promote weight gain in underweight patients. IN UNDERWEIGHT PATIENTS." Clin Med 71 (1964): 989-95
It is possible that some side effects of Winstrol may not have been reported. These can be reported to the FDA here. Always consult a healthcare professional for medical advice.
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