Hello! Dr.Swarnlata. thanks for putting your query in HCM. I am a Gastroenterologist (DM)
Among the previous medicine which your father was taking, shelcal and alprax may lead to constipation
, and also with age motility of the gastrointestinal tract is reduced and also reduced mobility at this age may lead to constipation.
For gas problem
see whether milk or milk products make his more bloated if yes then please avoid them. Also there is a tablet named gasex from Himalaya company which I found very useful in these patients. Above all it is ayurvedic product so no long term side effect
For constipation if it was relieved with syrup cremaffin plus please continue with it. It also contain picosulphate as in syrup piclin, in addition it contains milk of magnesia
and liquid paraffin
which are also laxative. So Syp cremaffin plus will be more helpful, titrate its dose to have maximum benefit.
Instead of levosulpiride
I will advise to take itopride rather as it pan prokinetic agent.It will help in relieving constipation and bloating symptoms.
I hope I have answered your query. Please give feedback. Hope your father will be comfortable by this.