After consuming Kratom 15x, a user will notice its effect within five to ten minutes and the effects - both stimulating and sedative - can last for several hours kratom gel caps. If taken in lower doses, kratom typically acts as a stimulant while in higher doses, it most often becomes a sedative. Some of the major effects of kratom, including pain killing, seem to be quite similar to opiates. If about 1 gram of kratom is dissolved in water, its soporific effects may last for 4 to 8 hours while in lower doses, it induces a mild euphoria and reduces fatigue along with greater energy and the ability to concentrate better.