Answer From Michael F. Picco, M.D. There's no evidence that daily use of fiber supplements — such as psyllium (Metamucil, Konsyl, others) or methylcellulose (
How long does it take for Metamucil to kick in?
The active ingredient, psyllium husk, is a soluble viscous fibre that absorbs and holds moisture. This causes the psyllium to swell, supplying the necessary bulk to help form an easily eliminated stool. Metamucil will not cause immediate evacuation but generally produces an effect in 12 to 72 hours.
Why Metamucil is bad?
However, it can also interfere with certain medications and may cause digestive issues for some people, including bloating, belching, and gas. Due to these risks, you should only take Metamucil after consulting your healthcare provider.