Group characteristics and mechanism of action
Substances in this group are based on 17-alkylated androgens. Prominent representatives of this pharmacological group include Nandrolone and Methandienone. The main feature of their pharmacodynamics lies in the dissociation of effects: the anabolic action is very pronounced, whereas the androgenic action is significantly weaker than that of natural hormones. These drugs effectively stimulate protein synthesis in the body and promote bone tissue calcification.
Clinical indications and doping control
In medical practice, anabolic steroids have strictly limited indications for use. They are prescribed for:
- Muscular dystrophy;
- Osteoporosis.
In professional sports, these compounds are used for the artificial enhancement of athletic performance. However, they are officially classified as prohibited substances (doping). Detecting traces of the drug in an athlete's biological fluids inevitably leads to disqualification.
Adverse effects on various systems
Most adverse body reactions are associated with the residual androgenic activity of the drugs:
- In children: they cause premature closure of epiphyseal growth plates (growth retardation), as well as early puberty and virilization.
- In women: they provoke masculinization (acne, alopecia, hirsutism, voice deepening) and disrupt the menstrual cycle.
- In men: they lead to suppression of spermatogenesis, testicular atrophy (via a negative feedback mechanism), and psychoemotional disorders (depression, mood swings, irritability, and aggressiveness).
- Systemic disorders: they raise blood pressure, cause hyperlipidemia, and impair liver function (hepatotoxicity).
Briefly: answers to topical questions
What is the negative feedback mechanism when steroids act on men?
The negative feedback mechanism during the action of anabolic steroids in men is related to the fact that high levels of sex hormones lead to a decrease in the secretion of releasing factors and gonadotropins.
Clinical manifestations in men:
- suppression of spermatogenesis;
- testicular atrophy.
Anabolic for proteins and bones, but the androgenic tail hits the liver, blood pressure, and reproductive system.
Class and exam questions
What is the pharmacodynamic feature of anabolic steroids?
Their main property is a pronounced anabolic effect with significantly lower androgenic activity compared to natural hormones.
What are the main medical indications for prescribing these drugs?
Steroids are used for muscular dystrophy and osteoporosis to stimulate protein synthesis and strengthen bone tissue.
Why is the use of steroids in sports strictly punished?
They belong to the class of prohibited substances (doping) and are used for the artificial enhancement of athletic performance, which violates the principles of fair play.
What are the main adverse effects of anabolics associated with?
Most adverse reactions are due to their residual androgenic activity, affecting the reproductive, endocrine, cardiovascular systems, and the liver.
What else to study on this topic
- Structural formula of Methandienone and the role of the 17-alkyl group
- Negative feedback mechanism in the suppression of spermatogenesis and testicular atrophy
- Pathogenesis of 17-alkylated androgen hepatotoxicity
- Effect of anabolics on lipid profile and the development of hyperlipidemia
- Mechanisms of premature closure of epiphyseal growth plates in children
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