Probiotic capsule use for diabetics.

My father is in his early sixties now with high BP and diabetes (Fasting: 99, PP: 173, HBA1C: 6.2) and takes daily medication for both (Arbitel 40 & Glycomet GP 0.5).He has had gastric issues since many years now. But off late, these issues seem to be escalating. He has been taking 1 PAN D also once a day since the last 15 days. He suffers from excessive flatulence, constant passing of smelly gas and constipation issues. He needs to go to the washroom as soon as he finishes his lunch everyday. Still it doesn't clear his bowel. Want to know if it is ok for him to take probiotic capsules available in the market. Have heard many good reviews for them. It would be great if any one of them can help relieve my father's condition. Please advise on the same and suggest any probiotic capsule names, if possible. Also, pl. Let me know how many CFU probiotic will be suitable for my father's condition.