Muscle twitching

Template:Proofread Muscle spasms can be described as an experience where one undergoes a sudden, uncomfortable, involuntary contraction of a muscle, a group of muscles, or a hollow organ such as a heart, or a similarly sudden contraction of an orifice.

The term most commonly refers to a muscle cramp which is often accompanied by a sudden burst of pain, but is usually harmless and ceases after a few minutes. There are a variety of other causes of involuntary muscle contractions, which may be more serious, depending on the cause.

Psychoactive substances

Compounds within our psychoactive substance index which may cause this effect include:

See also

• Anticonvulsant
• Subjective effects index
• Deliriants - Subjective effects
• Psychedelics - Subjective effects
• Dissociatives - Subjective effects