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Q: To prepare for my colonoscopy, my doctor said I should drink a special solution. Are those drinks kosher?
A: It appears that there are two types of solutions used to flush the patient’s colon, one of which is polyethylene glycol based (e.g. GoLYTELY) and the other is sodium phosphate based (e.g. Fleet Phospho-soda EZ Prep). The ingredients used in the unflavored versions of both of these solutions do not pose a kashrus concern and may be consumed. These solutions are also available pre-flavored or with a “flavor pack” that one adds to the solution, and these are not recommended.
If someone is unable to drink the unflavored solution and their doctor recommends that they not use the tablets, then there is halachic basis for allowing the person to consume the flavored solution and they should consult with their Rabbi.