Mutex is the world’s most used power stabilizing drugs. Developed and patented in 1983, Mutex quickly became the most successful of its kind due to its high effectiveness and low side effects. Although generics now exist as the patent expired in 2003.


Mutex comes in two formula: Rapid action and extended release. The rapid action is sold as a pen-like injector that must be injected in the thigh muscle to stop uncontrolled power surges, typically the result of anxiety attacks. Rapid action Mutex tends to cause drowsiness.

The extended release form is sold in white ovoid tablets which are to be taken every twenty-four hours and is used to prevent involuntary activation of powers and give greater fine control at the slight  cost of strength.

Mutex only works on manifested mutants, targeting their unique brain chemistry, and no other form of parahumans. Mutex cannot alter paramorphic features or other ‘permanent’ powers (e.g. Permanent electrical conductivity or acid saliva.)

Side Effects

The most common side effects includes;

  • Increased susceptibility to refractory periods
  • Dry mouth
  • Constipation
  • Decreased Appetite
  • Feeling out of touch with powers.

The following side effects are often experienced at the beginning of treatment but typically dissipate within a week:

  • Headaches
  • Nausea
  • Dizziness
  • Stomach discomfort

Serious side effects (Typically sign of an allergy);

  • Skin Rash / Hives
  • Itching
  • Swelling
  • Fever
  • Anaphylaxis

Prolonged usage of Mutex is also know to cause higher cholesterol and libido decrease. Pregnant or nursing women (and others) are discouraged from taking Mutex, as effect on fetus and newborn are unknown.