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I will tell you otherwise, you can still feed the snake for medication purposes. Firstly ad, try and fix the cause of constipation, whats the humidity like? If the enclosure is too cold, the snake may wrap itself around the heatsource, this will harden the stool, and the snake will be unable to pass the stool through its digestion system.

I would suggest injecting mineral oil into a small food item, about 1mL per KG of body weight, when the food is digested, the oil will be released and the stool passed out shortly after! This worked for when I treated several constipated snakes at a friends collection, thankfully he no longer keeps herps!! Mites and everything he had!

Also you could soak the snake in shallow warm water for around 15mins per day, for about half a week (4days)