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Home » Uncategorized » Sanofi Gets US FDA Approval For Priftin, Rifapentine 利福喷汀 Tablets To Treat Latent TB Infection

Sanofi Gets US FDA Approval For Priftin, Rifapentine 利福喷汀 Tablets To Treat Latent TB Infection



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French drug maker Sanofi  Tuesday said it has received approval from the U.S. Food and Drug Administration for its Priftin (rifapentine) tablets to treat latent tuberculosis infection, or LTBI.

CID 5462354.png

Following a priority review, FDA has approved Priftin in combination with isoniazid, or INH, for a new indication for treatment of LTBI in patients two years of age and older at high risk of progression to tuberculosis or TB disease.



Antibiotic DL 473IT;Cyclopentylrifampicin;DL 473;KTC 1;MDL 473;Prifitin;Priftin;R 77-3;Rifamycin AF/ACPP;

Rifapentine is an antibiotic drug used in the treatment of tuberculosis. It inhibits DNA-dependent RNA polymerase activity in susceptible cells. Specifically, it interacts with bacterial RNA polymerase but does not inhibit the mammalian enzyme.

For the treatment of pulmonary tuberculosis


Systematic (IUPAC) name
(7S,9E,11S,12R,13S,14R,15R,16R,17S,18S,19E,21Z,26E)-26-{[(4-cyclopentylpiperazin-1-yl)amino]methylidene}-2,15,17,29-tetrahydroxy-11-methoxy-3,7,12,14,16,18,22-heptamethyl-6,23,27-trioxo-8,30-dioxa-24-azatetracyclo[,7.05,28]triaconta-1(28),2,4,9,19,21,25(29)-heptaen-13-yl acetate
Clinical data
AHFS/ monograph
MedlinePlus a602026
Legal status
Pharmacokinetic data
Bioavailability increases when administered with food
CAS number 61379-65-5 Yes
ATC code J04AB05
PubChem CID 5462354
DrugBank DB01201
ChemSpider 10482075 Yes
KEGG D00879 Yes
ChEBI CHEBI:45304 Yes
NIAID ChemDB 007686
Synonyms 3{[(4-cyclopentyl-1-piperazinyl)imino]methyl}rifamycin
Chemical data
Formula C47H64N4O12 
Mol. mass 877.031 g/mol

Rifapentine (INN, marketed under the brand name Priftin by Sanofi-Aventis) is an antibiotic drug used in the treatment of tuberculosis.

Rifapentine was first synthesized in 1965 by the same company that produced rifampin. The drug was approved by the Food and Drug Administration (FDA) in June 1998.


Medical uses

A review of alternative regimens for prevention of active tuberculosis in HIV-negative individuals with latent TB found that a weekly, directly observed regimen of rifapentine with isoniazid for three months was as effective as a daily, self -administered regimen of isoniazid for nine months. But the rifapentine-isoniazid regimen had higher rates of treatment completion and lower rates of hepatotoxicity. However, the rate of treatment-limiting adverse events was higher in the rifapentine-isoniazid regimen. [1]

PRIFTIN (rifapentine) for oral administration contains 150 mg of the active ingredient rifapentine per tablet.

The 150 mg tablets also contain, as inactive ingredients: calcium stearate, disodium EDTA, FD&C Blue No. 2 aluminum lake, hydroxypropyl cellulose, hypromellose USP, microcrystalline cellulose, polyethylene glycol, pregelatinized starch, propylene glycol, sodium ascorbate, sodium lauryl sulfate, sodium starch glycolate, synthetic red iron oxide, and titanium dioxide.

Rifapentine is a rifamycin derivative antibiotic and has a similar profile of microbiological activity to rifampin (rifampicin). The molecular weight is 877.04.

The molecular formula is C47H64N4O12.

The chemical name for rifapentine is rifamycin, 3-[[(4-cyclopentyl-1-piperazinyl)imino]methyl]-or 3-[N-(4-Cyclopentyl – 1-piperazinyl)formimidoyl] rifamycin or 5,6,9,17,19,21-hexahydroxy-23-methoxy-2,4,12,16,18,20,22-heptamethyl-8-[N-(4-cyclopentyl-l-piperazinyl)-formimidoyl]-2,7-(epoxypentadeca[1,11,13]trienimino)naphtho[2,1-b]furan-1,11(2H)-dione 21-acetate. It has the following structure:

PRIFTIN (rifapentine) structural formula illustration


Use in special populations


Rifapentine has been assigned a Pregnancy Category C by the FDA. Rifapentine in pregnant women has not been studied, but animal reproduction studies have resulted in fetal harm and were teratogenic. If rifapentine and rifampin are used together in pregnancy, coagulation should be monitored due to a possible increased risk of maternal postpartum hemorrhage and infant bleeding. [2]

Adverse effects

Common side effects are hyperuricemia, pyuria, hematuria, urinary tract infection, proteinuria, neutropenia, anemia, and hypoglycemia. [2]


Rifapentine should be avoided in patients with an allergy to the rifamycin class of drugs. [2] This drug class includes rifampin and rifabutin. [3]


Rifapentine induces metabolism by CYP3A4, CYP2C8 and CYP2C9 enzymes. It may be necessary to adjust the dosage of drugs metabolized by these enzymes if they are taken with rifapentine. Examples of drugs that may be affected by rifapentine include warfarin, propranolol, digoxin, protease inhibitors and oral contraceptives.[2]


Rifapentine was first synthesized in 1965 by the same company that produced rifampin. The drug was approved by the Food and Drug Administration (FDA) in June 1998. It is synthesized in one step from rifampicine.


Rifapentine was first synthesized in 1965 by the same company that produced rifampin. The drug was approved by the Food and Drug Administration (FDA) in June 1998.

(7S,11S,12S,13S,14R,15S,16R,17R,18R,26E)-26-{[(4-Cyclopentyl-1-piperazinyl)amino]methylene}-2,15,17,29-tetrahydroxy-11-methoxy-3,7,12,14,16,18,22-heptamethyl-6,23,27-trioxo-8,30-dioxa-24-azatetracyclo [,7.05,28]triaconta-1(28),2,4,9,19,21,25(29)-heptaen-13-yl acetate. Rifapentine is an antibiotic drug used in the treatment of tuberculosis.

Preparation of Rifapentine: this chemical can be prepared by 3-aldehyde rifamycin SV with 1-Amino-4-cyclopentylpiperazine. This reaction needs reagent tetrahydrofuran. The yield is 55 %


  1. Sharma SK et al . (2013). “Rifamycins (rifampicin, rifabutin and rifapentine) compared to isoniazid for preventing tuberculosis in HIV-negative people at risk of active TB.”. Cochrane Database of Systematic Reviews 7: CD007545. doi:10.1002/14651858.CD007545.pub2. PMID 23828580.
  2. Sanofi-Aventis. (2010) Priftin (rifapentine): Highlights of Prescribing Information. Retrieved from
  3. CDC. (2013) Core Curriculum on Tuberculosis: What the Clinician Should Know. Retrieved from

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DR ANTHONY MELVIN CRASTO, Born in Mumbai in 1964 and graduated from Mumbai University, Completed his Ph.D from ICT, 1991,Matunga, Mumbai, India, in Organic Chemistry, The thesis topic was Synthesis of Novel Pyrethroid Analogues, Currently he is working with AFRICURE PHARMA as ADVISOR, earlier assignment was with GLENMARK LIFE SCIENCES LTD, as CONSUlTANT, Retired from GLENMARK in Jan2022 Research Centre as Principal Scientist, Process Research (bulk actives) at Mahape, Navi Mumbai, India. Total Industry exp 32 plus yrs, Prior to joining Glenmark, he has worked with major multinationals like Hoechst Marion Roussel, now Sanofi, Searle India Ltd, now RPG lifesciences, etc. He has worked with notable scientists like Dr K Nagarajan, Dr Ralph Stapel, Prof S Seshadri, etc, He did custom synthesis for major multinationals in his career like BASF, Novartis, Sanofi, etc., He has worked in Discovery, Natural products, Bulk drugs, Generics, Intermediates, Fine chemicals, Neutraceuticals, GMP, Scaleups, etc, he is now helping millions, has 9 million plus hits on Google on all Organic chemistry websites. His friends call him Open superstar worlddrugtracker. His New Drug Approvals, Green Chemistry International, All about drugs, Eurekamoments, Organic spectroscopy international, etc in organic chemistry are some most read blogs He has hands on experience in initiation and developing novel routes for drug molecules and implementation them on commercial scale over a 32 PLUS year tenure till date Feb 2023, Around 35 plus products in his career. He has good knowledge of IPM, GMP, Regulatory aspects, he has several International patents published worldwide . He has good proficiency in Technology transfer, Spectroscopy, Stereochemistry, Synthesis, Polymorphism etc., He suffered a paralytic stroke/ Acute Transverse mylitis in Dec 2007 and is 90 %Paralysed, He is bound to a wheelchair, this seems to have injected feul in him to help chemists all around the world, he is more active than before and is pushing boundaries, He has 100 million plus hits on Google, 2.5 lakh plus connections on all networking sites, 100 Lakh plus views on dozen plus blogs, 227 countries, 7 continents, He makes himself available to all, contact him on +91 9323115463, email, Twitter, @amcrasto , He lives and will die for his family, 90% paralysis cannot kill his soul., Notably he has 38 lakh plus views on New Drug Approvals Blog in 227 countries...... , He appreciates the help he gets from one and all, Friends, Family, Glenmark, Readers, Wellwishers, Doctors, Drug authorities, His Contacts, Physiotherapist, etc He has total of 32 International and Indian awards

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