When should i take laxative? have been constipated for 2 days.

Perhaps: Do fluids, water, prune juice, fruit, Before any of the chemicals

Many options : Start by looking up a high fiber diet, drinking a lot of water. Dehydration is associated with constipation. Food choices are also greatly important. If that does not work, you can buy over the counter Miralax which you mix powder with water and drink once daily to soften your stools. Usually hydration and high fiber diet should help resolve symptoms.

You: could first try fluids, increased fiber, then stool softener and then laxative if all others failed