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  • Name: Pyrazinamide Capsules
  • Add time: 2015-05-15
  • Views : 385

Chemical Name: pyrazine carboxamide
Chemical Structure:
$ Capsule contents of the white or off-white powder.
This product is only effective Mycobacterium, and other anti-TB drugs (such as streptomycin, isoniazid, rifampicin and ethambutol) combined for the treatment of tuberculosis.
Oral. The usual dose for adults, and other anti-TB drugs, the daily 15 ~ 30mg / kg Dayton clothing, or 50 ~ 70mg / kg, 2 or 3 times a week; daily use by the maximum daily 2g, up to 3 times in a week Every 3g, 2 times per week to a maximum per 4g.
Adverse reactions
A higher incidence of persons: joint pain (due to hyperuricemia caused, often mild, self-limiting); incidence is less: loss of appetite, fever, fatigue or weakness, yellowing of the eyes or skin (liver toxicity) , chills.
Not to proceed with the experiment and no reliable references.
1. Cross allergy, similar to B isonicotinoyl amine, isoniazid, niacin, or other chemical structure of drug allergy patients may have allergies to the chemicals.
2. The diagnosis of interference: It can be used to produce hydrogen cyanide and nitro red-brown, affect the measurement results ketone; can alanine aminotransferase, aspartate aminotransferase, serum uric acid concentration increased measured values.
3. Diabetes, gout or severe liver dysfunction with caution.
4. FDA should treatment often increased uric acid in the blood, can cause acute gout, serum uric acid should be performed.
5. This product can also use intermittent dosing method, medication 2 times a week, each 50mg / kg.
[Pregnant women and lactating women drug]
TB patients can be pregnant with isoniazid, rifampicin and ethambutol 9 months of treatment, such as any of the above drug resistance while the product may be considered sensitive goods. This product is FDA pregnancy drug class C.
Pediatric Use
This product is a high toxicity, children should not be applied. After the decision must be weighed against the application.
[Geriatric medicine]
Not to proceed with the experiment and no reliable references.
Drug interactions
1. The goods and allopurinol, colchicine, probenecid, sulfinpyrazone combined to increase serum uric acid concentration and reduce the efficacy of these drugs for gout. Therefore, dose adjustment should be combined in order to control hyperuricemia and gout.
2. Adverse reactions can be enhanced when combined with acetic isonicotinoyl amine.
3. And pyrazinamide with the use of cyclosporine blood concentration of the former may be reduced, and therefore the need to monitor blood levels to adjust the dose accordingly.
Not to proceed with the experiment and no reliable references.
Pharmacology and Toxicology
The product of the human type Mycobacterium tuberculosis has a good antibacterial effect, in pH5 ~ 5.5, the sterilization of the strongest, especially in the slow growth in the acidic environment of phagocytes is the best sterilization TB drugs. This product is in vivo inhibitory concentration 12.5μg / ml, up to 50μg / ml can kill Mycobacterium tuberculosis. The product inhibition of the intracellular concentration of Mycobacterium tuberculosis in the extracellular lower than 10 times, almost no inhibitory effect in neutral and alkaline environment. The mechanism may be related to the pyrazine acid, pyrazinamide infiltrated into phagocytic cells and Mycobacterium tuberculosis bacteria enter the body, the bacteria in vivo lactamase it deamidated, pyrazine acid into play antibacterial effect. Another result of pyrazinamide similar in chemical structure and nicotinamide, substituted by interference dehydrogenase and nicotinamide, to prevent dehydrogenation, Mycobacterium tuberculosis to prevent oxygen utilization, while affecting the normal metabolism of the bacteria, resulting in death.
Rapidly and completely absorbed after oral administration in the gastrointestinal tract. Widely distributed in body tissues and fluids, including liver, lung, cerebrospinal fluid, kidney and bile. Cerebrospinal fluid drug concentrations up blood concentration of 87% to 105%. Protein binding rate of about 10% to 20%. 2 hours after oral administration up to the peak plasma concentration, T1 / 2 of 9 to 10 hours, liver, renal dysfunction may be extended. Mainly metabolized in the liver, hydrolyzed to the pyrazine acid as a metabolite with antibacterial activity, followed by hydroxylation into inactive metabolites excreted by glomerular filtration. Within 24 hours of metabolites from 70% (of which the pyrazine acid about 33%), 3% of the prototype discharge. 4 hours of hemodialysis can reduce blood concentration of 55% pyrazinamide, blood pyrazine acid reduced by 50% to 60%.
Shading, sealed and stored.
Plastic bottles, 100 / bottle.
36 months
[Executive standard]
"Chinese Pharmacopoeia" 2010 edition Third Supplement
Approval Number
Zhunzi H21022352
Company Name: Shenyang Hongqi Pharmaceutical Co., Ltd.
Production Address: Shenyang Hunnan new network on the 6th Street Postcode: 110179
Phone Number: (024) 2,378,626,023,786,261 Fax: (024) 23786263


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