The only side effects are gastrointestinal. And only the first few times you use it, then they stop happening. I've used it hundreds of times over many years, and side effects stopped completely after 5 uses.
So the day you plan to use it eat lightly.
After the injection you may feel nauseous for a few minutes, then it will go away.
It slows down digestion, so you might have constipation or the opposite later in the day. So don't eat too much.
Within one hour you'll feel intense libido and get a very strong erection. Not like Viagra. which only works on the "plumbing", this works on the sexual center in the brain.
Then the sexual pleasure enhancing effect will lighten for a few hours, and come back even stronger than the first time for a few more hours.
It will keep working for almost two days, and your nocturnal and morning erections will return.
The slightest brush against your penis will be intensely pleasurable. You will yawn and stretch and run your fingers through your hair, without thinking, because everything involving your body feels so good
Pleasure will be enhanced by 2-3x over what you're used to.
This is a very safe drug, FDA approved. Because it works on the brain not the genitalia, it's even prescribed to women who no longer feel attracted to their ugly husbands:
PT-141 is Bremelanotide, sold as "Vyleesi" in the US:
Take control of your sex life. Learn about Vyleesi® (bremelanotide injection) the only FDA-approved, on-demand treatment for women with low sex drive (HSDD).
vyleesi.com
For men it fixes the "Brain -> Penis" connection. They give it to men with spinal cord injuries, so they can regain enough sensation to father children. In some cases. after a few doses they no longer need it.
Ask any questions you may have. I'm not bragging, but from extensive use and research I've become an expert on this drug.
DO NOT make the mistake of using too small a dose. I think many men try a low dose, feel all the side effects, without experiencing what PT-141 can do, and decide it's not worth it. No less than .025mg/kg. I use 3-3.5mg at 85kg.
Just put up with a few minutes of nausea, (similar to semaglutide) know it will go away quickly, then you'll have a very good experience for 1.5 to 2 days.