What are some good laxatives that work right away or at least in the range of 1-3 hours?

Here are some laxatives that are known to work quickly, usually within 1-3 hours:

1. Bisacodyl (Dulcolax, Correctol): This stimulant laxative works by increasing the contractions of the colon, promoting the movement of stool. It can take 15 minutes to an hour to start working.

2. Glycerin suppositories: Glycerin suppositories work by lubricating the rectum, making it easier to pass stool. They usually start working within 15 minutes to an hour.

3. Polyethylene glycol (MiraLAX, Glycolax): Polyethylene glycol is an osmotic laxative that draws water into the colon, softening and bulking up the stool. It usually takes 1-3 hours to work.

4. Sodium phosphate (Fleet Phospho-Soda): Sodium phosphate is a saline laxative that works by increasing the amount of water in the colon. It usually takes 2-5 hours to start working.

5. Magnesium sulfate (Epsom salt): Magnesium sulfate is an osmotic laxative that works by drawing water into the colon. It usually takes 2-4 hours to start working.

It's important to note that these are just general guidelines, and the exact time it takes for a laxative to work can vary from person to person. If you are experiencing constipation, be sure to talk to a healthcare professional before using any laxative, especially if you have underlying medical conditions or are taking any medications.