I take it the term you are searching for is "constipated".
In medicine, "blockage" and "obstruction" are used interchangably, although, obstruction is typically the more technical term. This condition is occasionally seen in small children after antihelmenthic treatment is administered and occurs from a massive bolus of dead worms, usually ascarid and considered a medical emergency (i.e. surgical). You may want to refrain from mentioning to a trained physician that you are suffering a bowel obstruction, lest they schedule you for an emergency surgery or perhaps simply consider you nuts (more likely).
Regarding the biltricide, might I suggest that you may want to read the article at the following link: