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Key Information



Pyrovalerone (Naphyrone)

PyrovaleroneNaphyrone is a stimulant produced using a chemical called Pyrovalerone (a Class C drug
developed in the 1960s as an appetite suppressant and to reduce fatigue).


1-(4-methylphenyl)-2-(1-pyrrolidinyl)-1-pentanone, monohydrochloride


NRG-1, NRG1, Energy-1, Energy1, Rave


Naphyrone has a chemical structure which is closely related to other 'cathinone derivatives'. Therefore it may be assumed that it would share the same effects as other cathinones.  Effects of cathinones are euphoria, talka-tiveness, alertness and feelings of empathy.


A fine white or off-white/yellow powder – usually snorted like cocaine or swallowed ‘bombed’ in wraps of paper.

HEALTH RISKS (long term) including withdrawal & tolerance:

Naphyrone has a chemical structure which is closely related to 'cathinone derivatives'.            Therefore, it is sensible to assume that it would share the same risks as other cathinones. Cathinones can cause anxiety, para-noia, overstimulation of the heart and circulatory system and overexcitation of the nervous system (with the risk of fits).  Other risks include reduced inhibitions, drowsiness, coma, seizures, and death. Risks, including the risk of death, could be increased if used with other substances, including alcohol.      Although there is lit-tle evidence on naphyrone, like other ‘cathinone derivatives’ it is very likely to be able to create a state of psy-chological dependence, with increased use associated with increased health harms.


Naphyrone was controlled as a Class B drug on the 23rd July 2010 meaning it is illegal to have, give away or sell. Possession can get you up to five years in jail. Supplying someone else, including your friends, can get you up to fourteen years in jail and an unlimited fine.

  1. Naphyrone has been marketed under false claims that it is 'plant food', 'pond cleaner' etc in order to circumvent various controls on medicines.
  2. The drug is consumed either by sniffing the powder or swallowing it wrapped in a cigarette paper, a technique known as ‘bombing’.
  3. Head shops and online legal high sellers often claim that naphyrone is the main ingredient in products labelled as NRG1 – one of the first ‘legal highs’ to be marketed as a ‘new legal alternative’ to mephedrone.
  4. Naphyrone does not have a long history of use, so there is little evidence of its long term effects or on the risks from using it. Likely dangers associated with naphyrone are becoming clearer as more reports emerge.
  5. Naphyrone is a stimulant drug closely related to the chemical family of the ‘cathi-nones’ group of drugs including mephedrone.  Cathinones are ‘cousins’ of the family of amphetamine compounds which include amphetamine itself (speed), metham-phetamine and ecstasy (MDMA), among many others.
  6. Naphyrone is similar to mephedrone in that it is a cathinone derivative and belongs to a group of drugs similar in effect to drugs with amphetamine compounds.
  7. Naphyrone is 13 times stronger than coke and even more addictive than heroin.
  8. NRG-1 users can stay awake for three days at a time and experience paranoia and suicidal tendencies.  They could also face permanent memory loss.
  9. Naphyrone is a stimulant drug closely related to ‘cathinone derivatives’ including mephedrone, a group of drugs that are ‘cousins’ of the family of amphetamine com-pounds which include amphetamine itself (speed), methamphetamine and ecstasy (MDMA), among many others.
  10. Naphyrone has a chemical structure which is closely related to other 'cathinone de-rivatives'.
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