Around fifth part of the injected steroid binds to progestin receptors (due to the absence of a carbon atom in the 19 position), and therefore, such reactions as the suppression of secretion of gonadotropin-releasing hormone, increased production of prolactin, a significant decrease in libido should not be excluded. Weak erection - the most pronounced and severe consequence of abuse of deca nandrolone. Exceeding of the recommended dosage and duration of the course may cause rhinitis, headache, back pain, rash. In general, the side effects of nortestosterone decanoate - rather the exception than the rule.
Anabolic steroids (ABS) boldenone (BL; mg/kg) and stanozolol (ST; mg/kg) were administered . to horses and the plasma samples collected up to 64 days. Anabolic steroids and androgenic steroids (ANS) in plasma were quantified using liquid chromatography-tandem mass spectrometry (LC-MS/MS). The limit of detection of all analytes was 25 pg/mL. The median absorption (t1/2 partial differential) and elimination (t1/2e) half-lives for BL were h and h, respectively, and the area under the plasma concentration-time curve (AUCho) was /mL. The median t1/2e for ST was h and the was /mL. Peak mean (X+/-SD) plasma concentrations (Cmax) for BL and ST were and pg/mL, respectively. Quantifiable concentrations of ABS and ANS were found in % of the 988 plasma samples tested from race tracks. In % of the plasma samples two or more ABS or ANS were quantifiable. Testosterone (TES) concentrations mean (X+/-SE) in racing and nonracing intact males were +/- and +/- pg/mL, respectively. TES was not quantified in nonracing geldings and female horses, but was in racing females and geldings. Plasma concentrations of endogenous 19-nortestosterone (nandrolone; NA) from racing and nonracing males were +/- and +/- pg/mL, respectively.