Before a medication in a solid dosage form is administered through a feeding tube, it should be determined if the medication is suitable for manipulation, such as crushing a tablet or opening a capsule.
Williams NT. Medication administration through enteral feeding tubes. Am J Health Syst Pharm. 2008 Dec 15;65(24):2347-57. doi: 10.2146/ajhp080155. PMID: 19052281.
It is important to check which medications should be given through the G-port and/or the J-port. Some medications can only be absorbed in the stomach, therefore, they must be given through the G-port. Others can be given safely through either port.
Marilyn Schallom. How to recognize, prevent, and troubleshoot mechanical complications of enteral feeding tubes. MyAmericanNurse, Feb 2016. https://www.myamericannurse.com/recognize-prevent-troubleshoot-mechanical-complications-enteral-feeding-tubes/.
Some Liquid medications contribute to tube clogging when exposed to enteral nutrition formula. Liquid syrups, for instance, cause clumping and lead to tube clogging. 
lansoprazole oral suspension granules, sucralfate suspension, and mineral oil are known to clog feeding tubes.
Schallom, Marilyn. “How to Recognize, Prevent, and Troubleshoot Mechanical Complications of Enteral Feeding Tubes.” American Nurse, 23 July 2020, www.myamericannurse.com/recognize-prevent-troubleshoot-mechanical-complications-enteral-feeding-tubes/.