Rimantadine (INN, sold under the trade name Flumadine[1]) is an orally administered antiviral drug[2] used to treat, and in rare cases prevent, influenzavirus A infection. When taken within one to two days of developing symptoms, rimantadine can shorten the duration and moderate the severity of influenza. Rimantadine can mitigate symptoms, including fever.[3] Both rimantadine and the similar drug amantadine are derivates of adamantane. Rimantadine is found to be more effective than amantadine because when used the patient displays fewer symptoms.[4] Rimantadine was approved by the Food and Drug Administration (FDA) in 1994.
Rimantadine was approved for medical use in 1993.[5] Seasonal H3N2 and 2009 pandemic flu samples tested have shown resistance to rimantadine, and it is no longer recommended to prescribe for treatment of the flu.[6]
Medical uses
Influenza A
Rimantadine inhibits influenza activity by binding to amino acids in the M2 transmembrane channel and blocking proton transport across the M2 channel.[7] Rimantadine is believed to inhibit influenza's viral replication, possibly by preventing the uncoating of the virus's protective shells, which are the envelope and capsid. The M2 channel is known to be responsible for viral replication in the influenza virus. Genetic studies suggest that the virus M2 protein, an ion channel specified by virion M2 gene, plays an important role in the susceptibility of influenza A virus to inhibition by rimantadine.[citation needed]
Rimantadine is bound inside the pore to amantadine specific amino acid binding sites with hydrogen binding and van der Waals interactions.[8] The ammonium group (with neighboring water molecules) is positioned towards the C terminus with the amantadane group is positioned towards the N-terminus when bound inside the M2 pore.[citation needed]
Rimantadine S31N Mutation Binding
Influenza resistance
Resistance to rimantadine can occur as a result of amino acid substitutions at certain locations in the transmembrane region of M2. This prevents binding of the antiviral to the channel.[9]
The mutation S31N binding site with rimantadine is shown in the image to the left. It shows rimantadine binding into lumenal (top) or peripheral (bottom) binding sites with influenza M2 channel Serine 31 (gold) or Asparagine 31 (blue).[citation needed]
Rimantadine enantiomers interactions with M2
Rimantadine, when sold as flumadine, is present as a racemic mixture; the R and S states are both present in the drug. Solid state NMR studies have shown that the R enantiomer has a stronger binding affinity to the M2 channel pore than the S-enantiomer of rimantadine.[10]Antiviral assay and electrophysiology studies show that there is no significant difference between the R and S enantiomers in binding affinity to amino acids in the M2 channel.[11] Since the enantiomers have similar binding affinity, they also have similar ability to block the channel pore and work as an effective antiviral.[citation needed]
Rimantadine enantiomers R and S are pictured interacting with the M2 pore below to the right. This image shows that there is not a significant modeled difference between the R and S enantiomers.
Parkinson's disease
Rimantadine, like its antiviral cousin amantadine, possesses antiparkinsonian activity and can be used in the treatment of Parkinson's disease.[12][13] However, in general, neither rimantadine nor amantadine is a preferred agent for this therapy and would be reserved for cases of the disease that are less responsive to front-line treatments.[citation needed]
Rimantadine can produce gastrointestinal and central nervous systemadverse effects. Approximately 6% of patients (compared to 4% of patients taking a placebo) reported side-effects at a dosage of 200 mg/d.[16] Common side effects include:
Rimantadine shows fewer CNS symptoms than its sister drug amantadine.[17]
Interactions
Taking paracetamol (acetaminophen, Tylenol) or acetylsalicylic acid (aspirin) while taking rimantadine is known to reduce the body's uptake of rimantadine by approximately 12%.[18]
1-carboxyadamatanones are reduced with sodium borohydride to create racemic hydroxy acid. Excess methyllithium is then added to create methyl ketones which when reduced with lithium aluminum hydride gives the amine group.[26]
The synthesis pictured to the left is a synthesis of rimantadine as synthesized in Europe.
History
Rimantadine was discovered in 1963[27][28] and patented in 1965 in the US by William W. Prichard in Du Pont & Co., Wilmington, Delaware (patent on new chemical compound U.S. patent 3,352,912, 1965 and on the first method of synthesis U.S. patent 3,592,934, 1967).[29][30] Prichard's methods of synthesis of rimantadine from the corresponding ketone oxime were based on its reduction with lithium aluminum hydride.[citation needed]
^Evidente VG, Adler CH, Caviness JN, Gwinn-Hardy K (1999). "A pilot study on the motor effects of rimantadine in Parkinson's disease". Clin Neuropharmacol. 22 (1): 30–32. doi:10.1097/00002826-199901000-00006. PMID10047931.
^Singer C, Papapetropoulos S, Gonzalez MA, Roberts EL, Lieberman A (July 2005). "Rimantadine in Parkinson's disease patients experiencing peripheral adverse effects from amantadine: report of a case series". Mov Disord. 20 (7): 873–877. doi:10.1002/mds.20471. PMID15809995.
^Zlydnikov DM, Kubar OI, Kovaleva TP, Kamforin LE (1981-05-01). "Study of rimantadine in the USSR: a review of the literature". Reviews of Infectious Diseases. 3 (3): 408–21. doi:10.1093/clinids/3.3.408. PMID7025146.
^Younossi ZM, Perrillo RP (1999). "The roles of amantadine, rimantadine, ursodeoxycholic acid, and NSAIDs, alone or in combination with alpha interferons, in the treatment of chronic hepatitis C". Seminars in Liver Disease. 19 (Suppl 1): 95–102. PMID10349697.
^Manchand PS, Cerruti RL, Martin JA, Hill CH, Merrett JH, Keech E, et al. (July 1990). "Synthesis and antiviral activity of metabolites of rimantadine". Journal of Medicinal Chemistry. 33 (7): 1992–5. doi:10.1021/jm00169a029. PMID2362279.
^United States Patent № 4551552: Process for preparing rimantadine: Rimantadine and related compounds useful as antivirals were first described by Prichard in U.S. Pat. Nos. 3,352,912 and 3,592,934. Both patents describe the preparation of rimantadine from the corresponding ketone oxime by reduction with lithium aluminum hydride.
^Zlydnikov DM, Kubar OI, Kovaleva TP, Kamforin LE (1981). "Study of rimantadine in the USSR: a review of the literature". Reviews of Infectious Diseases. 3 (3): 408–21. doi:10.1093/clinids/3.3.408. PMID7025146.