Muscle twitching can be described as the sensation of small and localised tremblings of muscle groups. These vibrations are often powerful enough to be visibly seen through the skin. The sensations they induce can be uncomfortable in certain contexts but are usually neutral to experience.
Muscle twitching is most commonly induced under the influence of moderate dosages of stimulating psychedelic compounds such as LSD, 2C-E, DOC, and AMT. However, it can also occur under the influence of traditional stimulants.