Can energy drinks cause erectile dysfunction? There is no good evidence that they do. Caffeine, their main active ingredient, is not among the causes of erectile dysfunction that healthdirect lists, and studies of caffeine and erections have found either no link or fewer erection problems in men with a moderate intake. What can matter is heavy use, which can disturb sleep and push up blood pressure, and energy drinks mixed with alcohol.
How much caffeine is in an energy drink?
About 80 mg in a 250 mL can, the same as a teaspoon of instant coffee; an espresso has about 145 mg. Caffeine also comes from guarana, a South American plant with high levels of natural caffeine, so check ingredient lists. Healthy adults can safely have around 400 mg of caffeine a day (healthdirect — caffeine). Larger cans and several drinks a day add up quickly.
Does caffeine cause erectile dysfunction?
Not on the evidence so far. It is not on healthdirect's list of causes, which names reduced blood flow, nerve and hormone problems, some medicines, alcohol, smoking and psychological causes (healthdirect — erectile dysfunction). In a survey of 3,724 US men, those taking 85–170 mg or 171–303 mg of caffeine a day were less likely to report erectile dysfunction than those taking 0–7 mg, though with no steady trend, and the authors say it needs testing in studies that follow men over time (Lopez et al., PLoS One 2015). A genetic study found no link between coffee or caffeine and erectile dysfunction either way (Xiang et al., Front Endocrinol 2024). Neither looked at energy drinks, and healthdirect notes that "Much of the research into the effects of caffeine has only looked at coffee" (healthdirect — caffeine). Coffee itself: does caffeine or coffee cause erectile dysfunction?
When could energy drinks affect erections?
When the habit is heavy. Regular use of more than 600 mg of caffeine a day can cause insomnia, anxiety and depression, and if you have high blood pressure, caffeine can raise it further (healthdirect — caffeine). High blood pressure, obesity and sleep disorders are among the conditions healthdirect lists as contributing to erectile dysfunction, and anxiety and depression are psychological causes (healthdirect — erectile dysfunction). So several cans a day, especially late in the day, could add to problems through sleep disturbances or blood pressure — an indirect route, not a proven effect of the drinks.
What about energy drinks mixed with alcohol?
That is the combination to watch. Caffeine "can hide some of the effects of the alcohol. This can cause you to drink more and lead to more risk-taking behaviours", and it does not sober you up (healthdirect — caffeine). Alcohol itself "can temporarily impair the ability to get an erection" (Viagra CMI), and of the habits people ask about, excessive alcohol and tobacco use are the ones on healthdirect's list of causes of erectile dysfunction.
Can you drink energy drinks with Viagra?
Caffeine is not a listed interaction with Viagra, though caffeine speeds up the heart and sex puts some strain on it. That question has its own pages: can you mix energy drinks with Viagra? and can you drink coffee with Viagra? ED medicines need a prescription in Australia (healthdirect — ED medicines).
What does help erections?
The habits on healthdirect's prevention list: stop smoking, exercise more, lose weight and eat healthy food (healthdirect — erectile dysfunction). In practice that means avoiding smoking and excessive alcohol use, keeping to a healthy weight and staying active. Regular exercise helps in its own right. If erection problems keep happening, see your GP: they are often the first sign of cardiovascular disease, high blood pressure or high cholesterol (healthdirect — erectile dysfunction).
The short answer
Energy drinks are not a known cause of erectile dysfunction, and moderate caffeine has not been linked with it. Heavy use can disturb sleep and raise blood pressure, and mixed with alcohol they can lead to drinking more, which does affect erections. Keep to around 400 mg of caffeine a day. Other habits are covered in our guide to lifestyle and erectile dysfunction.
