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Chem Fiend is an Endurance-based perk in Fallout 76.


Extends the duration of consumed chems.


Rank Description Form ID
1 Any chems you take last 30% longer. 00259E62
2 Any chems you take last 60% longer. 00259EF7
3 Any chems you take last twice as long. 00259F1C
Nuclear Winter battle-royale Any chems you take last 100% longer. 00479B27


Chem Fiend affects the following chems:

Addictol Antibiotics Berry mentats
Blood pack Buffout Bufftats
Calmex Daddy-O Day tripper
Disease cure Formula P Fury
Glowing blood Glowing blood pack Grape mentats
High-radiation fluids Insect repellent Irradiated blood pack
Med-X Mentats Nuclear Don's Custom Chem Blend
Orange mentats Overdrive Psycho
Psychobuff Psychotats Rad-X
Rad-X: diluted Radaway Radaway: diluted
RadShield Skeeto Spit Super chem Mk I

Nuclear Winter

Chem Fiend affected the following chems:


  • Chem Fiend extends the duration of RadAway, which increases the overall healing output.
  • In Fallout 76, only one chem can be in effect at any given time. One can no longer stack multiple effects.
  • Although it affects addictol and disease cure, the duration magnitude of these items is set to 0, so Chem Fiend has no impact.