“DECA DICK”: What causes it and how to prevent it

“Deca Dick” is a term used to describe the tendency of the AAS Nandrolone (19-nortestosterone) to cause erectile dysfunction, even when one is using a test base and has a healthy sex drive, positive mood and high energy levels.

In this article, we will be taking a look at the possible causes of “Deca Dick” and what you can do to make sure it does not occur.


Testosterone undergoes a process known as “5-alpha-reduction”, which turns it into a powerful androgenic metabolite known as Dihydrotestosterone (DHT). DHT is responsible for the development of male sexual organs, body and facial hair growth, sebaceous gland activity, sexual function and pretty much everything that distinguishes men from women.

Well, Nandrolone also “5-alpha-reduces” into a similar metabolite, known as dihydronandrolone (DHN). The problem, however, is that DHN is very weak, meaning that it does not stimulate sex drive and sexual function to the same extent as DHT.

When one is using, for example, 200mg/wk of Testosterone + 400mg/wk of Deca, DHN dominates over DHT because there is more Nandrolone to turn into DHN than Testosterone to turn into DHT.

This can lead to DHN dominating over DHT and attaching to androgen receptors despite having little to no androgenic activity to provide.

Can one prevent this from occurring? Yes! Here is how:

One should always use a Testosterone dose equal or greater than the Nandrolone dose. This way one can guarantee that theirr DHT levels exceed their DHN levels and can exert their androgenic and pro-sexual function properties.

Another possible solution is to add 25 to 50mg of Proviron a day to your stack. This is because Proviron acts as DHT and helps counteract the negative effect of DHN on sexual function.


An often-overlooked property of Nandrolone is that it binds to progesterone receptors, causing prolactin levels to increase significantly over the course of a cycle.

Prolactin is essential for male reproductive health, but letting it skyrocket can lead to sexual dysfunction, gynecomastia, lactation and lethargy.

Therefore, when running a high dose of Nandrolone one should not only make sure his Testosterone dose is equal to it (or greater), but one should also take an ancillary medication or supplement to combat high prolactin levels.

There are 3 options to choose from:

  • Vitamin B6 (P5P) at 200mg/day: This only works with lower doses of Nandrolone (up to 200mg a week) because it is not strong enough to keep prolactin levels under control when blasting it.
  • Cabergoline at 0.5mg twice a week: Very effective, tends to improve mood and sexual function as well, but is dangerous for the heart.
  • Pramipexole at 0.125mg every other day: Very effective, will not improve mood and sexual function as much as Cabergoline (or at all), but it will not damage the heart either.

Now you know what the causes of this infamous side-effect are and what you can do to prevent it, you are better prepared to run a Nandrolone cycle effectively.

Have you experienced this side-effect or used any of these tips to eradicate it? Share your experience in the comments below!



William Davis

William has been studying and experimenting with bodybuilding pharmacology for over 6 years. After being an independent researcher for all these years, he has decided to share his knowledge with the bodybuilding community through his science-based articles. His approach to enhanced bodybuilding can be summed up in the saying “less is more”, as he believes that prioritizing harm mitigation and looking for ways to maximize the positives is the key to longevity in bodybuilding.

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