Hi,
I have gone through your father's medical history carefully and understood his concerns.
Fenofibrate is a medication of fibrate class used to treat high
cholesterol and triglycerides levels.
One possible side effects of this drug is diarrhea or frequent
loose stool sometimes.
The current problems your father is having are due to
constipation, and not related to fenofibrate use/stop.
He should change his eating habits:
- increase intake of fiber rich foods (kiwi, prunes, etc)
- fiber supplements can help (psyllium, prunes, etc)
- give gentle laxative like Sena as tea or candies to help bowel movement
- ask to increase water intake
- ask to have small walking especially after eating to ease digestion
- anal enema can help clean his colon
If this does not work, consult with a gastroenterologist.
Wish fast recovery.