36.6 Androgens, Antiandrogens, and Anabolic Steroids

Androgens, Antiandrogens, and Anabolic Steroids

Androgens, antiandrogens, and anabolic steroids are hormonal agents used to treat a range of reproductive and endocrine conditions. Nurses need a solid grasp of how these drugs work, what to monitor, and how to educate patients, since these medications carry significant risks alongside their therapeutic benefits.

Androgens, Antiandrogens, and Anabolic Steroids in Reproductive Health

Androgens are the male sex hormones, with testosterone being the most important one. They drive the development and maintenance of male secondary sex characteristics: deepening of the voice, facial hair growth, increased muscle mass, and sperm production. Clinically, androgens are prescribed for:

• Hypogonadism (when the body doesn't produce enough testosterone)
• Delayed puberty in adolescent males
• Certain types of breast cancer in women (palliative use)

Antiandrogens work by blocking the effects of androgens at the receptor level or by reducing androgen production. They're used in conditions where androgen activity is harmful or unwanted:

• Prostate cancer (androgen-dependent tumors rely on testosterone to grow)
• Hirsutism (excessive hair growth in women)
• Severe acne driven by androgen activity

Common antiandrogens include flutamide, bicalutamide, and spironolactone. Spironolactone is worth remembering because it's primarily a potassium-sparing diuretic that also has antiandrogenic properties, so it shows up in multiple clinical contexts.

Anabolic steroids are synthetic derivatives of testosterone designed to maximize the protein-building (anabolic) effects while minimizing the masculinizing (androgenic) effects. Legitimate medical uses include:

• Muscle wasting disorders such as cachexia (severe weight and muscle loss seen in cancer or HIV/AIDS)
• Certain types of anemia (they stimulate erythropoiesis)

These drugs are frequently misused for athletic performance enhancement, which is both illegal without a prescription and medically dangerous.

Therapeutic Uses, Mechanisms of Action, and Side Effects

Androgens

• Mechanism: Bind to intracellular androgen receptors, which then act as transcription factors to promote expression of genes responsible for male sex characteristics and anabolic processes.
• Uses: Hypogonadism, delayed puberty, palliative breast cancer treatment.
• Side effects: Acne, male-pattern hair loss, prostate enlargement (benign prostatic hyperplasia), liver toxicity (especially with oral formulations), erythrocytosis (elevated red blood cell count increasing clot risk), mood changes.

Antiandrogens

• Mechanism: Block androgen receptors (flutamide, bicalutamide) or inhibit androgen production. Spironolactone also blocks the androgen receptor directly and reduces testosterone synthesis.
• Uses: Prostate cancer, hirsutism, acne.
• Side effects: Gynecomastia (breast tissue enlargement in men), hot flashes, decreased libido, fatigue, and hepatotoxicity (particularly with flutamide, which requires liver function monitoring).

Anabolic Steroids

• Mechanism: Promote protein synthesis in skeletal muscle and stimulate bone marrow erythropoiesis. They bind the same androgen receptor as testosterone but are structurally modified to favor anabolic over androgenic effects.
• Uses: Muscle wasting (cachexia), certain anemias.
• Side effects: Liver damage (peliosis hepatis, cholestatic jaundice), cardiovascular harm (unfavorable lipid changes with decreased HDL and increased LDL, increasing risk of heart attack and stroke), aggression and mood disturbances, testicular atrophy and infertility in men, virilization in women.

Nursing Considerations: Monitoring and Safety Precautions

Monitoring

• Liver function tests (LFTs): Baseline and periodic monitoring, especially with oral androgens and anabolic steroids. Watch for elevated AST/ALT, jaundice, or right upper quadrant pain.
• Lipid profile: Anabolic steroids and androgens can shift lipids unfavorably. Track cholesterol and triglycerides.
• Prostate-specific antigen (PSA): For male patients on androgen therapy. A rising PSA may indicate prostate enlargement or malignancy.
• Complete blood count (CBC): Androgens stimulate red blood cell production. Monitor hematocrit to catch erythrocytosis early (hematocrit above 54% is a red flag for increased clot risk).
• Signs of virilization in female patients: Deepening voice, facial hair growth, clitoral enlargement, menstrual irregularities. Some of these changes can be irreversible, so early detection matters.

Safety Precautions

• Educate patients on proper administration technique. Testosterone comes in several formulations: intramuscular injection, transdermal patches, topical gels, and subcutaneous pellets. Each has specific application instructions.
• For topical testosterone gels, warn patients about secondary transfer: the gel can transfer testosterone to partners or children through skin contact. Patients should wash hands after application and cover the application site with clothing.
• Advise patients to report signs of adverse reactions promptly: yellowing of skin or eyes, unusual swelling, chest pain, or mood changes.
• Caution against sharing medications or using them for non-prescribed purposes.

Drug Interactions

• Anticoagulants (warfarin): Androgens can enhance the effect of warfarin, increasing bleeding risk. Monitor INR closely and anticipate dose adjustments.
• Insulin and oral hypoglycemics: Androgens may improve insulin sensitivity, potentially causing hypoglycemia in diabetic patients. Blood glucose monitoring should increase when starting or adjusting androgen therapy.
• Corticosteroids: Concurrent use with anabolic steroids increases the risk of edema and fluid retention.

Patient Education: Safe Use, Concerns, and Lifestyle Modifications

Proper Administration

1. Teach the correct technique for the prescribed route. For intramuscular injections, review site selection (vastus lateralis, ventrogluteal), needle gauge, and aseptic technique.
2. For topical gels, instruct patients to apply to clean, dry skin on the upper arms, shoulders, or abdomen (not the genitals). Allow the gel to dry completely before dressing.
3. Stress the importance of following prescribed dosages and schedules. Skipping doses or doubling up can cause hormonal fluctuations and worsen side effects.

Lifestyle Modifications

• A balanced diet and regular exercise support the therapeutic goals of androgen therapy and help manage cardiovascular risk.
• Advise patients to limit or avoid alcohol, since both alcohol and these medications can stress the liver.
• Smoking cessation is especially important given the cardiovascular risks associated with these drugs.
• Adequate sleep and stress management support hormonal balance and overall treatment response.

Common Concerns

• Fertility: Exogenous testosterone suppresses the hypothalamic-pituitary-gonadal axis, which reduces sperm production. Male patients who want to preserve fertility should discuss this before starting therapy. Contraception should be discussed with female patients on antiandrogens, as some (like spironolactone) are teratogenic.
• Mood and behavioral changes: Patients and family members should be aware that androgens and anabolic steroids can cause irritability, aggression, or depression. Encourage reporting these changes early.
• When to seek immediate medical attention: Chest pain, shortness of breath, sudden severe headache, signs of liver dysfunction (dark urine, jaundice, persistent nausea), or signs of deep vein thrombosis (unilateral leg swelling, warmth, pain).

Follow-Up Care

• Schedule regular appointments to review labs, assess therapeutic response, and adjust dosages as needed.
• Encourage patients to keep a log of symptoms and any side effects they notice between visits.
• Reinforce that open communication with the healthcare team is essential for safe, effective treatment.