I take it with breakfast and dinner almost every day. With me it often works within the hour. If you are severely constipated you may find that you need a stool softener to correct the problem and then can use the Metamucil to help prevent it from occuring again. I drink it well stirred and with ice cubes so it tastes pretty good but if lumps form from not stirring enough, I don't try to drink them.
You can search the forum for Metamucil and will find other alternatives that people use.
Barbara - Started South Beach 5/22/4 Restarting 8/15/16
HW/SW/CW/GW - Aug start 213 goal of 2