FAVIPIRAVIR 200mg TABLETS
Fabiflu
is an antiviral medicine. Fabiflu is used for the treatment of Influenza. Fabiflu
is a pyrazine carboxamide derivative like (T-1105 & T-1106). Fabiflu is
also being studied and used to treat a number of other viral infections. It
became a common drug.
Mechanism of
action:
The
mechanism of action is thought to be combined with the selective inhibition of
viral RNA-dependent RNA polymerase. Other research suggests that Fabiflu
induces lethal RNA transversion mutations, producing an unwise viral phenotype.
Fabiflu is a prodrug that is used to metabolize an active form, Fabiflu-ribofuranosyl-5'-triphosphate
(Fabiflu-RTP), available in both oral and intravenous formulations. Human
hypoxanthine-guanine phosphoribosyltransferase (HGPRT) is treated to play a key
role in this activation process. Fabiflu does not prevent RNA or DNA synthesis
in mammalian cells and is not toxic to them. However, Fabiflu has not been
shown to be active in primary human airway cells, casting doubt on its potency
in influenza treatment.
Drug
Interaction
Fabiflu
inhibited irreversibly AO in a dose and time-dependent manner and inhibited
CYP2C8 in a dose-dependent manner. There was no inhibitory action to XO, and
weak inhibitory movement to CYP1A2. The hydroxylase metabolite showed weak
inhibitory action to CYP1A2. Inductive effect of Fabiflu on CYP was not
recognized.
PHARMACOKINETICS
1. Absorption
When Fabiflu was given as a single dose
of 400 mg with food, the Cmax reduced. It develops that Fabiflu is given at a
higher dose or in multiple doses, irreversible inhibition of aldehyde oxidase
(AO) appear and the effect of food on the Cmax is lower.
2.
Distribution
Fabiflu is an antibody protein binding
ratio was 53.4 to 54.4% (Centrifugal ultrafiltration) at 0.3 - 30 μg/ml.
3. Metabolism
Fabiflu was not metabolized by cytochrome
P-450 (CYP), mainly metabolized by aldehyde oxidase (AO), and slightly
metabolized to a hydroxylated form by xanthine oxidase (XO).
4. Excretion
Fabiflu
was mainly secreted as a hydroxylated form into the urine 0.8% and little
amount of unaffected drug 53.1% was noticed. The half-life of Fabiflu is
concluded to range from 2 to 5.5 hours.
Uses:
Fabiflu
is determined for novel influenza (strains that cause more severe disease)
rather than recurring influenza.
Side Effects:
Recommended
not to use during pregnancy because its impairment to the baby
Contraindications
There
are several contraindications when using Fabiflu tablets. In the history of
patients is a hypersensitivity to any ingredient of a drug.
Pregnancy and
Lactation
·
Fabiflu should not be used in a Pregnancy situation
·
No breastfeeding is suggested
Storage:
Fabiflu
tablets capsule should be stocked at room temperature at below 30℃(86 ℉) Fabiflu container
should be kept away from humidity, warmth, and sun
Dosage and
Administration
The
Common dose of Fabiflu for adults is 1600 mg orally twice in a day replace by
600 mg orally twice for 4 days. The total composition time should be for 5
days.