Yes -you can increase dosage if necessary .Its used a lot in Nursing Homes for bedridden patients .I’ve tried just about everything over many years , been hospitalised twice with it and even had to use enemas / suppositories - nothing has come near Movicol to gently , quickly and effectively solve the problem but best not to get in the spot in first place as is awful.By the sounds of it you may need to be extra vigilant during treatment with your diet . Hoping this resolve quickly.