Nonoxynol-9, sometimes abbreviated as N-9, is an organic compound that is used as a surfactant. It is a member of the nonoxynol family of nonionic surfactants. N-9 and related compounds are ingredients in various cleaning and cosmetic products.



  • It is widely used in contraceptives for its spermicidal properties.


  • Spermicides are locally acting non-hormonal contraceptives. When present in the vagina during intercourse, they immobilize/inactivate/damage and/or kill sperms without eliciting systemic effects.


  • No side effects are known, although in several European countries, spermicides are no longer on the market.


  • Not known.

Other names

  • 26-(Nonylphenoxy)-3,6,9,12,15,18,21,24-octaoxahexacosan-1-ol
  • Nonaethylene glycol mono(nonylphenyl) ether
  • Nonaethylene glycol nonylphenyl ether
  • Nonoxynol 9
  • Nonylphenol octa(oxyethylene) ethanol
  • P-Nonylphenyl polyethylene glycol ether
  • PEG-9 nonyl phenyl ether
  • Polyoxyethylene (9) nonyl phenyl ether
  • Tergitol NP-9
  • Tergitol NP9


Source: Drugabank,


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