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CAS Registry Number: 494-79-1
CAS Name: 2-[4-[(4,6-Diamino-1,3,5-triazin-2-yl)amino]phenyl]-1,3,2-dithiarsolane-4-methanol
Additional Names: p-[(4,6-diamino-s-triazin-2-yl)amino]dithiobenzenearsonous acid 3-hydroxypropylene ester; 2-p-(4,6-diamino-s-triazin-2-ylamino)phenyl-4-hydroxymethyl-1,3,2-dithiarsoline; 2-(4-melamin-2-ylphenyl)-4-hydroxymethyl-1,3-dithia-2-arsolane
Trademarks: Mel B; Arsobal (Specia)
Molecular Formula: C12H15AsN6OS2
Molecular Weight: 398.34
Percent Composition: C 36.18%, H 3.80%, As 18.81%, N 21.10%, O 4.02%, S 16.10%
Literature References: Prepn: Friedheim, US 2659723 (1953); US 2772303 (1956).
Properties: Practically insol in water, cold ethanol, methanol. Sol in propylene glycol.
Therap-Cat: Antiprotozoal (Trypanosoma).
Keywords: Antiprotozoal (Trypanosoma).

Melarsoprol is a medication used for the treatment of sleeping sickness (African trypanosomiasis).[1] It is specifically used for second-stage disease caused by Trypanosoma brucei rhodesiense when the central nervous system is involved.[1] For Trypanosoma brucei gambienseeflornithine or fexinidazole is usually preferred.[1] It is effective in about 95% of people.[3] It is given by injection into a vein.[2]

Melarsoprol has a high number of side effects.[4] Common side effects include brain dysfunction, numbness, rashes, and kidney and liver problems.[2] About 1-5% of people die during treatment.[3] In those with glucose-6-phosphate dehydrogenase (G6PD) deficiencyred blood cell breakdown may occur.[2] It has not been studied in pregnancy.[2] It works by blocking pyruvate kinase, an enzyme required for aerobic metabolism by the parasite.[2]

Melarsoprol has been used medically since 1949.[1] It is on the World Health Organization’s List of Essential Medicines, the safest and most effective medicines needed in a health system.[5] In regions of the world where the disease is common, melarsoprol is provided for free by the World Health Organization.[4] It is not commercially available in Canada or the United States.[2] In the United States, it may be obtained from the Centers for Disease Control and Prevention, while in Canada it is available from Health Canada.[1][2]

Medical uses

People diagnosed with trypanosome-caused disease should be treated with an anti-trypanosomal. Treatment is based on stage, 1 or 2, and parasite,T. b. rhodesiense or T. b. gambiense. In stage 1 disease, trypanosomes are present only in the peripheral circulation. In stage 2 disease, trypanosomes have crossed the blood-brain barrier and are present in the central nervous system.[6]

The following are considerable treatment options:[6]

Melarsoprol is a treatment used during the second stage of the disease. So far, it is the only treatment available for late-stage T. b. rhodesiense.[7]

Due to high toxicity, melarsoprol is reserved only for the most dangerous cases. Other agents associated with lower toxicity levels are used during stage 1 of the disease.[8] The approval of the nifurtimox-eflornithine combination therapy (NECT) in 2009 for the treatment of T. b. gambiense limited the use of melarsoprol to the treatment of second-stage T. b. rhodesiense.[9]

Failure rates of 27% in certain African countries have been reported.[10] This was caused by both drug resistance and additional mechanisms that have not yet been elucidated. Resistance is likely due to transport problems associated with the P2 transporter, an adenine-adenosine transporter. Resistance can occur with point mutations within this transporter.[11] Resistance has been present since the 1970s.[12]

Mechanism of action

Melarsoprol is a prodrug, which is metabolized to melarsen oxide (Mel Ox) as its active form. Mel Ox is an phenylarsonous acid derivative that irreversibly binds to sulfhydryl groups on pyruvate kinase, which disrupts energy production in the parasite. The inability to distinguish between host and parasite PK renders this drug highly toxic with many side effects.

Mel Ox also reacts with trypanothione (a spermidine-glutathione adduct that replaces glutathione in trypanosomes). It forms a melarsen oxide-trypanothione adduct (Mel T) that competitively inhibits trypanothione reductase, effectively killing the protist.[11]


The half-life of melarsoprol is less than one hour, but bioassays indicate a 35-hour half-life. This is commonly associated with pharmacologic agents that have active metabolites. One such metabolite, Mel Ox, reaches maximum plasma levels about 15 minutes after melarsoprol injection. Melarsoprol clearance is 21.5 ml/min/kg and the Mel Ox half-life is approximately 3.9 hours.[13]


Two arsenic-containing stereoisomers exist in a 3:1 molar ratio. Since melarsoprol is insoluble in water, dosage occurs via a 3.6% propylene glycol intravenous injection.[11] To avoid the risk of injection site reactions, melarsoprol must be given slowly.[citation needed]

Melarsoprol used for the treatment of African trypanosomiasis with CNS involvement is given under a complicated dosing schedule. The dosing schedule for children and adults is 2–3.6 mg/kg/day intravenously for three days, then repeated every seven days for a total of three series.[6] To monitor for relapse, follow-up is recommended every six months for at least two years.[3]

Side effects

Although melarsoprol cures about 96% of people with late stage disease, its toxicity limits its use.[7] About 1-5% of people die during treatment.[3] As a toxic organic compound of arsenic, melarsoprol is a dangerous treatment that is typically only administered by injection under the supervision of a licensed physician. Notable side effects are similar to arsenic poisoning. Among clinicians, it is colloquially referred to as “arsenic in antifreeze”.[14] Severe and life-threatening adverse reactions are associated with melarsoprol. It is known to cause a range of side effects including convulsions, fever, loss of consciousness, rashes, bloody stools, nausea and vomiting. In approximately 5-10% of cases, it causes encephalopathy. Of those, about 50% die due to encephalopathy-related adverse reactions.[6] Additional potentially serious side effects of melarsoprol include damage to the heart, presence of albumin in the urine that could be associated with kidney damage, and an increase in blood pressure.[3]


Numerous warnings must be examined before melarsoprol treatment can be initiated. Prior to initiation, the following must be noted: glucose-6-phosphate dehydrogenase deficiency, kidney or liver disease, cardiac problems (high blood pressure, irregular beating of the heart or arrhythmias, any damage to the heart muscles and potential signs of heart failure), preexisting nervous system disorders, and any signs of leprosy.

Routine laboratory testing is needed before and after melarsoprol initiation. Laboratory parameters for both therapeutic effects and toxic effects need to be evaluated.

Blood analysis is used to detect the presence of trypanosomes. An evaluation of the cerebrospinal fluid via a lumbar puncture is also used to determine an individual’s white blood count and level of protein. These are diagnostic criteria such that the presence of trypanosomes, an elevated white blood count greater than five per microliter, or a protein content greater than 40 mg are considered abnormal and initiation should be considered. Continuous cerebrospinal fluid evaluation should be repeated every six months for at least three years in individuals that have undergone melarsoprol treatment.

To assess potential concerns related to toxicity, the following should be completed: a complete blood count, an assessment of electrolyte levels, liver and kidney function tests, and a urinalysis to detect the appearance, concentration and content of the urine.

Melarsoprol should be given using glass syringes (if they can be reliably sterilised). The propylene glycol it contains is capable of dissolving plastic.[15]

Pregnancy and breastfeeding

Currently, melarsoprol is not recommended for use in pregnant women. The World Health Organization suggests that treatment be deferred until immediately after delivery since the effects of the medication on the developing fetus have not yet been established.[3]

Lactation guidelines associated with melarsoprol have not yet been established.

Society and culture

Melarsoprol is produced by Sanofi-Aventis and under an agreement with the WHO, they donate melarsoprol to countries where the disease is common.[medical citation needed]

Melarsoprol was used to treat a patient with African trypanosomiasis on season 1 episode 7 “Fidelity” of the medical drama House MD.[16]


Journal of Organometallic Chemistry (2006), 691(5), 1081-1084.

Graphical abstract

(2-Phenyl-[1,3,2]dithiarsolan-4-yl)-methanol derivatives were tested on K562 and U937 human leukemia cell lines. Their systemic toxicity was estimated by the corresponding LD50 on mice. The cytotoxic activity of each derivative was significantly better than that of arsenic trioxide and the therapeutic index (T.I. = LD50/IC50) was improved.


  1. Jump up to:a b c d e f “Our Formulary Infectious Diseases Laboratories CDC” 22 September 2016. Archived from the original on 16 December 2016. Retrieved 7 December 2016.
  2. Jump up to:a b c d e f g h “Melarsoprol Drug Information, Professional” 20 December 1994. Archived from the original on 30 December 2016. Retrieved 7 December 2016.
  3. Jump up to:a b c d e f “WHO Model Prescribing Information: Drugs Used in Parasitic Diseases – Second Edition: Protozoa: African trypanosomiasis: Melarsoprol”WHO. 1995. Archived from the original on 2016-11-10. Retrieved 2016-11-09.
  4. Jump up to:a b “Trypanosomiasis, human African (sleeping sickness)”World Health Organization. February 2016. Archived from the original on 4 December 2016. Retrieved 7 December 2016.
  5. ^ World Health Organization (2019). World Health Organization model list of essential medicines: 21st list 2019. Geneva: World Health Organization. hdl:10665/325771. WHO/MVP/EMP/IAU/2019.06. License: CC BY-NC-SA 3.0 IGO.
  6. Jump up to:a b c d CDC (2013). “Disease Control and Prevention: Parasites – African Trypanosomiasis”Archived from the original on 2017-06-19.
  7. Jump up to:a b “Trypanosoma brucei gambiense and Trypanosoma brucei rhodesiense (African Trypanosomiasis) – Infectious Disease and Antimicrobial Agents”www.antimicrobe.orgArchived from the original on 2016-11-28. Retrieved 2016-11-17.
  8. ^ Bisser S, N’Siesi FX, Lejon V, et al. (2007). “Equivalence trial of melarsoprol and nifurtimox monotherapy and combination therapy for the treatment of second-stage Trypanosoma brucei rhodesiense sleeping sickness”J. Infect. Dis195 (3): 322–9. doi:10.1086/510534PMID 17205469.
  9. ^ Farrar J (2014). “Manson’s Tropical Diseases: Expert Consult-Online”. 23: 616.
  10. ^ Kioy, D.; Jannin, J.; Mattock, N. (March 2004). “Human African trypanosomiasis”Nature Reviews Microbiology2 (3): 186–187. doi:10.1038/nrmicro848PMID 15751187S2CID 36525641.
  11. Jump up to:a b c Brunton L (2011). “Goodman & Gillman’s The Pharmacological Basis of Therapeutics”. McGraw Hill Medical: 1427–28.
  12. ^ Brun, Reto; Schumacher, Reto; Schmid, Cecile; Kunz, Christina; Burri, Christian (November 2001). “The phenomenon of treatment failures in Human African Trypanosomiasis”. Tropical Medicine and International Health6 (11): 906–914. doi:10.1046/j.1365-3156.2001.00775.xPMID 11703845S2CID 21542129.
  13. ^ Keiser J.; Ericsson O; Burri C (2000). “Investigations of the metabolites of the trypanocidal drug melarsoprol”. Clinical Pharmacology67 (5): 478–88. doi:10.1067/mcp.2000.105990PMID 10824626S2CID 24326873.
  14. ^ Hollingham R (2005). “Curing diseases modern medicine has left behind”New Scientist2005 (2482): 40–41. Archived from the original on 2015-05-11.
  15. ^ “MELARSOPROL injectable – Essential drugs” Retrieved 6 December 2019.
  16. ^ Holtz, Andrew (2006). The Medical Science of House, M.D.Penguin. p. 272. ISBN 1440628734. Retrieved 25 March 2020.

External links

Clinical data
Trade names Arsobal[1]
Other names Mel B, Melarsen Oxide-BAL[2]
AHFS/ Micromedex Detailed Consumer Information
Routes of
ATC code
Pharmacokinetic data
Elimination half-life 35 hours
Excretion Kidney
CAS Number
PubChem CID
CompTox Dashboard (EPA)
ECHA InfoCard 100.007.086 Edit this at Wikidata
Chemical and physical data
Formula C12H15AsN6OS2
Molar mass 398.33 g·mol−1
3D model (JSmol)
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