Impaction impacted rectum help!

You'll have to check him more often and clean out as necessary.

https://www.guinealynx.info/impaction.html

See post #7 in this thread for a great video on sac cleaning: https://www.guineapigcages.com/forum/about-guinea-pigs/64297-cleaning-perineal-sac.html.

Increasing his activity should also help. Make sure he's getting enough floor time, and encourage him to exercise.

the second male i rescued had impaction problems - he is 5 years old or so. i have to help him push his poo out twice a day. the hope is that he'll improve, but i was told that once older males loose the muscle tone in their rectum, they may never get it back enough to poo on their own. so, my poor old man is good about my squeezing his butt, and some days he is able to poo some out by himself. yes, for some reason that impacted poo is especially smelly. poor little old men! he gets lots of hay and floor time, and that's really the best you can do. good luck!

but i was told that once older males loose the muscle tone in their rectum, they may never get it back enough to poo on their own

Not necessarily true. Many pigs who were not previously fed appropriately, who had no companion, or lived in a small cage, become much better after getting the correct diet and exercise. I have had some pigs come into the rescue with horrible impaction problems that, after a month or so, only needed cleaning out once every few days, or even longer.