Rimantadine

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Rimantadine
Clinical data
Pregnancy
category
Routes of
administration
Oral
ATC code
Legal status
Legal status
  • ℞-only (U.S.)
Pharmacokinetic data
Bioavailabilitywell absorbed
Protein binding40%
MetabolismHepatic hydroxylation and glucuronidation
Elimination half-life25.4 ± 6.3 hours
ExcretionRenal
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CAS Number
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E number{{#property:P628}}
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Chemical and physical data
FormulaC12H21N
Molar mass179.302 g/mol

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Rimantadine (INN, sold under the trade name Flumadine) is an orally administered antiviral drug 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. It is a derivate of adamantane, like a similar drug amantadine. It was approved by the Food and Drug Administration (FDA) in 1994.

Mechanics

Scientists do not understand why rimantadine works, but believe it inhibits influenza's viral replication, possibly by preventing the uncoating of the virus's protective shells, which are the envelope and capsid. 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. Resistance to rimantadine can occur as a result of an amino acid substitutions at certain locations in the transmembrane region of M2. This prevents binding of the antiviral to the channel.

Drug interactions

Taking acetaminophen (Tylenol) or aspirin while taking rimantadine is known to reduce the body's uptake of rimantadine by approximately 12%.[2] Cimetidine also affects the body's uptake of rimantadine.

Adverse effects

Rimantadine can produce gastrointestinal and central nervous system adverse effects. Studies have shown it produces fewer side effects than other anti-viral influenza treatments. Approximately 6% of patients (compared to 6% of patients taking a placebo) reported side effects.[3] Common side effects include:

  • nausea
  • upset stomach
  • nervousness
  • tiredness
  • lightheadedness
  • trouble sleeping
  • difficulty concentrating

Other Uses

Rimantadine, like its antiviral cousin amantadine, possesses some NMDA antagonistic properties and is used as an antiparkinsonic drug (ie, in the treatment of Parkinson's Disease). However, neither rimantadine nor amantadine are preferred agents for this therapy and are generally reserved for cases of the disease which are less responsive to front-line treatments.

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