Tadalafil and Hair Loss or Testicular Pain
Tadalafil has not been reported to cause hair loss (alopecia) in humans, and testicular pain is not listed as an adverse effect in the FDA drug label or major clinical guidelines. 1
Hair Loss (Alopecia)
The FDA drug label for tadalafil does not list alopecia or hair loss as a reported adverse event 1. The most frequently reported adverse events with PDE5 inhibitors like tadalafil are:
- Dyspepsia
- Headache
- Flushing (lowest rates with tadalafil compared to other PDE5 inhibitors)
- Back pain
- Nasal congestion
- Myalgia
- Visual disturbance
- Dizziness 2
Hair loss is conspicuously absent from this list. The evidence on medication-induced alopecia 3 does not implicate tadalafil as a causative agent. If a patient reports hair loss while taking tadalafil, alternative etiologies should be investigated rather than attributing it to the medication.
Testicular Pain
Testicular pain is not documented as an adverse effect of tadalafil in the FDA label or clinical guidelines 1, 2, 4.
What the Evidence Shows About Testicular Effects:
The FDA label specifically addresses testicular safety:
- Human studies: Three studies (6-9 months duration) with tadalafil 10-20 mg daily showed no adverse effects on sperm morphology or motility 1
- One study showed decreased sperm concentration (not clinically meaningful), but this was not consistent across all studies 1
- No adverse effects on reproductive hormones (testosterone, LH, FSH) 1, 5
A dedicated human study confirmed that chronic daily tadalafil (10-20 mg for 6 months) had no adverse effects on spermatogenesis or reproductive hormones in men over 45 years 5.
Important Caveat - Animal Data:
The FDA label notes that in beagle dogs (not humans), tadalafil caused testicular degeneration at doses ≥10 mg/kg/day for 3-12 months 1. However, this finding:
- Has never been replicated in human studies 1, 5
- Occurred at systemic exposures similar to the human MRHD of 20 mg 1
- Was not seen in rats or mice at any dose 1
One rat study showed testicular effects with chronic use 6, but this contradicts human data and should not guide clinical decision-making.
Clinical Bottom Line
If a patient reports testicular pain while on tadalafil, investigate other causes (epididymitis, torsion, trauma, varicocele, referred pain from other sources) rather than assuming the medication is responsible. The extensive human safety data does not support tadalafil as a cause of testicular pain or hair loss.
The drug has been studied in nearly 250,000 men from general ED populations and 25,000 men from special populations with no reports of these adverse effects 2. Postmarketing surveillance has demonstrated no new cardiovascular or other safety concerns 4.