Muscle spasms

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Muscle spasms can be described as an experience where one undergoes a sudden involuntary contraction of a muscle or a group of muscles.

The term most commonly refers to a muscle cramp which may be 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