Pyrantel Pamoate is a very safe dewormer. Rehabbed raccoons are treated every 10-14 days upon intake until release, which is usually 5+ months old. I purchased the liquid version for humans and it is pleasant tasting so is readily accepted. I have attached some pictures out of the Wild Mammal Baby Book of different dewormers and the dosage.
The first photo is for panacur (Safeguard). It tastes nasty and the raccoons hate it. It wouldn’t be a good choice to treat the wilds with or your released guy.
I want to draw your attention to the picture for Pyrantel. The table gives the dosage for Nemex2 which has a much lower concentration of the active medicine (4.54mg/ml) than the human version of Pyrantel, which is 50mg/ml. This means that you can use a lower dosage than what the table indicates for the human version of the medicine. Again, this medication is very safe. I have accidentally dosed the human version following the Nemex2 chart and had no ill effects in my raccoons.