Rare? Do you have a source or citation to that comment or its just bro-talk...
It's happened to me several times in the past month. Never experienced it with tren or GH.
A simple google search would tell you Trazodone nightmares are actually fairly common.
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Regardless of which compound does or does not cause nightmares for you, you are only ONE person, so using your sole experience as a way of gauging side effect frequency in the general population isn't really reliable. For example, you say tren has never affected your dreams, but just on this bard alone you will find plenty of people whop have experienced this. Do I invalidate their experiences because YOU didn't experience the same?
With that said, I have done my research from two angles. For one, I asked both of my doctors about this before taking it because I read about it as a potential side effect...and they said NONE of their 100+ patients have reported it.
Now, if you take all dream disturbances into consideration, such as long, vivid, or memorable dreams, then the percentage rises considerably, but I don't think most people would consider that to be a negative side effect--and certainly not one worth discontinuing the medication over.
Here is how the trazadone-nightmares connection was explained to me. When someone has nightmares, whether it is trazadone induced or not, they are most often the outward manifestation of inner turmoil. If you evaluate the general population you will find that most happy, stress-free people without any pressing fears or worries usually don't have nightmares. They generally occur in individuals who are dealing with stress, hardships, fears, etc...and the worse these problems are, the more often and more severe their nightmares usually become.
So, in some instances trazadone may act a trigger for those predisposed to nightmares as a result of their subconscious/conscious inner psychic-emotional turmoil. In those who are not experiencing such issues, it is more likely to induce longer, more vivid, more intense dreams. The thing is--many who use trazadone ARE experiencing some type of inner turmoil. Hence the reason they can't sleep. This is why a small percentage of user's have nightmares.
Anyway, I am sure anyone who is interested in dreams can do additional research, but the point is that most nightmares occur in the setting of emotional turmoil of one type or another, either subconscious or not. So, trazadone simply makes it more likely for such individuals to experience nightmares, just as certain androgens make it more likely for anger-prone individuals to lash out aggressively but have little affect on easy-going individuals.
I've also done research online to see what others are saying, and considering the vast number of people who use the drug, it is rather uncommon. Even on this board, of all the times trazadone has been mentioned, you are the first and only one to mention this (that I know of). Everyone else seemed to have good experiences with it and recommended it for sleep--just like in this thread.
However, for those currently experiencing emotional stress/turmoil, it may be something they may want to consider as a potential "side effect".