For a while a few years back I was taking almost on a daily basis. I wasn't very knowledgeable on the variations of dairy content, plus many items didn't declare it back then. I was told it wasn't a good idea to use too often as I may cause the opposite. Thankfully I've seldom been constipated.
I still have in my bag, kitchen cupboard & bathroom unit. I think GPs feel it's best to avoid the cause, like dairy or whatever, though as I know myself that's not always possible.
Many pharmacists tend to refer to your GP, as changes in bowel habit could be something else.
My DIL took a whole pack once, pack of 6, on holiday. Couldn't go again for about 2 weeks. That caused it's own problems, so needed Senna.