Magnesium citrate
"I have some pain issues and a slow colon anyway so every time I have to take opiates I get severely backed up. Sometimes I get through it OK on my own but most times I need help. I'm a regular user, every 6 months or so and just have to add, there will be discomfort because the gas will finally be able to move and that hurts. But there is no cramping. It doesn't MAKE you go, it liquifies everything so its effortless to go. Be near a toilet and give yourself a day."