Before attributing low testosterone to aging or idiopathic hypogonadism, review your medication list. Several common drug classes suppress the HPG axis and lower testosterone — sometimes dramatically and sometimes reversibly.
High-Impact Medications
Opioids
Chronic opioid use is one of the most potent suppressors of testosterone. Opioid-induced androgen deficiency (OPIAD) affects 50–90% of men on long-term opioid therapy. The mechanism: opioids suppress GnRH pulsatility in the hypothalamus, reducing LH and FSH, which reduces testicular testosterone production. The effect is dose-dependent but can occur even at moderate doses.
Clinical implication: if you're on chronic opioid therapy and have low testosterone, opioid reduction or discontinuation (with appropriate medical supervision) may restore testosterone without requiring TRT.
Corticosteroids
Chronic glucocorticoid use (prednisone, dexamethasone) suppresses ACTH and gonadotropins, lowering testosterone. Even inhaled corticosteroids at high doses can have modest systemic effects. The suppression is usually reversible upon discontinuation but may take weeks to months for HPG axis recovery.
5-Alpha Reductase Inhibitors
Finasteride and dutasteride (used for hair loss and BPH) don't lower testosterone — they actually increase it slightly by blocking conversion to DHT. However, they dramatically reduce DHT, which mediates some of the sexual function and mood effects attributed to testosterone. "Low T symptoms" on finasteride may actually be low DHT effects.
Moderate-Impact Medications
- Certain antidepressants: SSRIs can affect HPG axis function modestly. Sexual dysfunction is common and may mask or mimic low-T symptoms.
- Spironolactone: Anti-androgen effects — blocks androgen receptors and can reduce testosterone levels
- Ketoconazole: Directly inhibits testicular steroidogenesis at high doses (less relevant for short-course antifungal use)
- Cimetidine: Anti-androgen properties — less commonly used now but still prescribed
- Some anticonvulsants: Increase SHBG, reducing free testosterone
Medication Review Checklist
- List all current medications, including OTC and supplements
- Cross-reference with known testosterone-suppressing drugs
- Discuss with prescribing provider whether alternatives exist
- If medication-induced, consider addressing the medication before starting TRT
- If the medication can't be changed, TRT treats the resulting hypogonadism — but document the cause
The Bottom Line
Check the Pill List Before Adding Another Pill
Medication-induced hypogonadism is common, often overlooked, and sometimes reversible. A careful medication review should precede any TRT prescription. If opioids, corticosteroids, or other suppressors are contributing to your low testosterone, addressing the medication may be more appropriate — and more effective — than adding testosterone on top.