Please fix the timing of Breakfast, Lunch & dinner. There should be gap of 4-5 hours in each meal, in between he can drink only water & nothing else. He should drink water upto 2-2 1/2 litre. Please Avoid eating sprouts, Bakery products, Non-veg, Fermented products, Over night Food, Paneer. Do yogasana like, 1) Pashimottasana 2) Ardhamatsendrasana 3) Mandukasana 4) Uttanpadasana 5) Naukasana 6) Padangusthanasasparshasana. You can take medicine Like 1)phaltrikadi kashay 4 tsp medicine + 4 tsp water mornin & Evenin. 2) Tapayadi Loha 2-2 tabs Mornin- evenin. 3) Arogawardhini tab 2-2 Afternoon & night.

Yes you can try castor oil 20ml with 1 cup of warm milk...panchasakar powder 5 gm at bed time is also effective...if possible consult ayurveda panchakarma specialist for kaala basti course of 16 days...

Triphala is one of the best and safest remedies for constipation.  It should be taken regularly for some days. Prepare a concoction by boiling 1 tsp of Triphala powder in 100 ml water for 10 min and then ask him to take this every night at bedtime..This form may give better results. Also you can try Abhayarishta 2 tsp with water   at bedtime. Along with medicines, he has to follow a proper diet and water intake should be good. He may also take a glass of hot milk with a spoon of pure ghee in the evening. If problem persists , please visit any ayurvedic doctor for much better management of chronic constipation through various other panchakarma treatments.

Hello....... You have tried medicines which are normally used .. He has to change his diet , semisolid food items , with more of fruits and green leafy vegetables . Water at least 2 to 3 litre per day and mild exercise in life is necessary to facilitate digestion...