Short answer: It can make it worse. US testosterone labels say treatment "may potentiate sleep apnea in some patients," especially with obesity or chronic lung disease. In a trial in obese men with severe sleep apnea, testosterone shots worsened night-time oxygen drops at 7 weeks, but the difference was gone by 18 weeks. The Endocrine Society advises against starting testosterone in untreated severe sleep apnea.
The AndroGel 1.62% (section 5.12), Kyzatrex (5.10), Xyosted (5.11) and Aveed (5.13) labels carry the same warning. They say testosterone treatment may potentiate sleep apnea in some patients, especially those with risk factors such as obesity or chronic lung disease.
Sleep apnea also shows up in reports collected after approval. The AndroGel 1.62% label (section 6.2) lists it under nervous system disorders, and the Aveed label lists "sleep apnea syndrome" and snoring among respiratory reports. These reports show that it happened, not how often.
Hoyos 2012 was a placebo-controlled trial in men who already had sleep apnea. 67 obese men with severe obstructive sleep apnea went on a reduced-calorie diet and got either 1,000 mg testosterone undecanoate shots or placebo at weeks 0, 6 and 12. Sleep studies were done at 0, 7 and 18 weeks.
| Measure | Week 7 | Week 18 |
|---|---|---|
| Oxygen drops per hour of sleep (ODI) | Worse by 10.3 events per hour | No significant difference |
| Sleep time with oxygen below 90% | Worse by 6.1% | No significant difference |
The worsening did not track testosterone levels at the start or during treatment. The authors summed it up as a mild worsening of breathing during sleep that was limited in time. The trial ran 18 weeks, so it cannot say what happens over years.
The Endocrine Society's 2018 guideline on testosterone therapy in men lists untreated severe obstructive sleep apnea among the conditions in which it recommends against starting testosterone, alongside a high hematocrit, recent heart attack or stroke, and a few others. The word that matters is "untreated": the list is about sleep apnea that is not being managed.
High hematocrit is a separate testosterone effect that is often raised in the same talk. TRT hematocrit monitoring covers it.
MedlinePlus lists loud snoring as a telltale sign, with silent pauses followed by a snort or gasp, often noticed by a partner rather than the sleeper. Daytime signs include waking unrefreshed, feeling sleepy during the day or while driving, morning headaches, irritability and forgetfulness. Risk factors include obesity and a neck size of 17 inches or more in men. A sleep study confirms it.
If snoring or daytime sleepiness starts or gets worse after starting testosterone, that is worth raising with the prescriber. Logging when it began next to your dose history, as Dose Track does, helps show whether the timing lines up. The TRT symptom tracker article covers what else to note.
Read more on Dose Track: AndroGel side effects · Aveed side effects · Sleep · TRT hematocrit monitoring