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Quinine hydrochloride
Common Name(s): Quinine
Molecular Formula: C20H24N2O2
Used For: Treatment of Cryptocaryon
Caution: Avoid inhalation
Material Safety Data Sheet: Quinine hydrochloride


Quinine hydrogen chloride is a drug used within the marine aquaria hobby for the treatment of Cryptocaryon. It is actually used in the treatment and prevention of malaria in humans. Commercial brands available include Vertonex, Resochin and Dawaquin. It is an anti-protozoal drug, killing the therots stage of Cryptocaryon on excystment from the tomont, thus stopping re-infection of new fish. Non-toxic to most fish at correct dosage rates (5-10mg/lt) but highly toxic to algae and some invertebrates. Non-toxic also to bacteria. Needs to be purchased through a qualified medical practitioner (either a medical doctor or veterinarian).[1]

See also Chloroquine.

One of the active ingredients in Vertonex. However, it is recommended to use quinine only, so purchase it from a doctor or vet.

Cryptocaryon Treatment

Dosage rate is 5 to 10 milligrams per litre.[1]

Conversions between quinine forms, 100 milligrams of quinine is equal to[2]:

  • 111 mg quinine hydrochloride
  • 169 mg quinine bisulfate
  • 122 mg quinine dihydrochloride
  • 121 mg quinine sulfate
  • 160 mg quinine gluconate



  1. 1.0 1.1 (http://reefculture.com.au/blog/2009/09/cryptocaryon-irritans-marine-white-spot/): Porritt, M., Cryptocaryon irritans, Reef Culture Magazine, 1.
  2. wikipedia:Quinine