Isoniazid is the hydrazide of isonicotinic acid. It is used to treat tuberculosis and HIV infection. Its therapeutic value results from its ability to block the synthesis of mycolic acids, which are components of the mycobacterial cell wall. What is the mechanism of action of isoniazid?
Mechanism of action — The antimicrobial activity of INH is selective for mycobacteria, likely due to its ability to inhibit mycolic acid synthesis, which interferes with cell wall synthesis, thereby producing a bactericidal effect [1].

What are the contraindications of isoniazid?

Who should not take ISONIAZID?

What is the difference between hydrazine and hydrazide?
Hydrazides in organic chemistry are a class of organic compounds with the formula RNHNH2 where R is acyl (R’CO-), sulfonyl (R’SO2-), or phosphoryl (R’2P(O)-). Unlike hydrazine and alkylhydrazines, hydrazides are nonbasic owing to the inductive influence of the acyl, sulfonyl, or phosphoryl substituent.

What agent belong to the first line drugs hydrazides of isonicotinic acid?

Isoniazid is the hydrazide of isonicotinic acid. It is a first-line drug for treatment and prevention of tuberculosis. What does isoniazid do to the body?

What is isoniazid? Isoniazid is an antibiotic that fights bacteria. Isoniazid is used to treat and to prevent tuberculosis (TB). You may need to take other TB medicines in combination with isoniazid.

Frequently Asked Questions(FAQ)

Does isoniazid inhibit cell wall synthesis?

Isoniazid is a potent antimicrobial agent and one of the most commonly used antituberculosis medications. It inhibits lipid and DNA synthesis of Mycobacterium tuberculosis resulting in inhibition of cell wall synthesis and development.

Why is B6 given with isoniazid?

Isoniazid can interfere with the activity of vitamin B6. Vitamin B6 supplementation is recommended, especially in people with poor nutritional status, to prevent development of isoniazid-induced peripheral neuritis (inflamed nerves). One case is reported in which injectable vitamin B6 reversed isoniazid-induced coma.

What type of inhibition is used by isoniazid?

Specifically isoniazid inhibits InhA, the enoyl reductase from Mycobacterium tuberculosis, by forming a covalent adduct with the NAD cofactor. It is the INH-NAD adduct that acts as a slow, tight-binding competitive inhibitor of InhA.

What is the target of isoniazid?

The preferred antitubercular drug isoniazid specifically targets a long-chain enoyl-acyl carrier protein reductase (InhA), an enzyme essential for mycolic acid biosynthesis in Mycobacterium tuberculosis. Despite the widespread use of this drug for more than 40 years, its precise mode of action has remained obscure.

Is isoniazid an inducer or inhibitor?

Is isoniazid contraindicated in pregnancy?

Isoniazid is recommended for use in pregnancy (pregnancy category A). Isoniazid may be associated with an increased risk of hepatotoxicity in pregnant women. Symptoms should therefore be assessed, and liver function tests are recommended fortnightly during the first two months of treatment, and then monthly.

Does isoniazid cause high blood pressure?

Isoniazid may interact with foods containing tyramine/histamine (such as cheese, red wine, certain types of fish). This interaction may cause increased blood pressure, flushing of the skin, headache, dizziness, or fast/pounding heartbeat. Tell your doctor right away if any of these symptoms occur.

Is isoniazid a chemotherapy drug?

The role of individual drugs in first-line chemotherapy of TB[31] is unique. Isoniazid is responsible for the initial kill of about 95% organisms during the first two days of treatment. Its bactericidal role is then replaced by rifampicin and pyrazinamide during the intensive phase.

What is hydrazide used for?

Hydrazide 25 Tablet 10’s belongs to a group of medicines called diuretics (which increase the production of urine). It is used to treat high blood pressure, heart failure and oedema (a build-up of fluid in the body). Diuretics are sometimes called ‘water pills’ because they make you urinate more.

How do you make hydrazide?

hydrazine preparation …is best prepared by the Raschig process, which involves the reaction of an aqueous alkaline ammonia solution with sodium hypochlorite (NaOCl). 2NH3 + NaOCl → N2H4 + NaCl + H2O This reaction is known to occur in two main steps.

What are the side effects of antituberculosis drugs?

Conclusions: Side effects to antituberculosis drugs are common, and include hepatitis, cutaneous reactions, gastrointestinal intolerance, haematological reactions and renal failure. These adverse effects must be recognised early, to reduce associated morbidity and mortality.

Which drug is metabolized by acetylation?

Drugs known to be metabolized by this pathway include procainamide, hydralazine, isoniazid, sulfapyridine, sulfadimidine, dapsone, an amine metabolite of nitrazepam, and some carcinogenic aromatic amines. Nongenetic factors may also affect the rate of acetylation.

Is Ethionamide synthetic drug?

Ethionamide is an antibiotic used to treat tuberculosis. Specifically it is used, along with other antituberculosis medications, to treat active multidrug-resistant tuberculosis. It is no longer recommended for leprosy. It is taken by mouth. … Ethionamide.

Clinical data
KEGG D00591

What is the most common side effect of isoniazid?

Common side effects may include: numbness, tingling, or burning pain in your hands or feet; nausea, vomiting, upset stomach; or. abnormal liver function tests.

Can I drink coffee while taking isoniazid?

Notes for Consumers: Try to limit caffeine intake while taking Isoniazid, INH. Side effects from Isoniazid, INH may get worse if you take Caffeine, like increased blood pressure, confusion, restlessness, or other side effects.

Does isoniazid cause liver damage?

Even with monitoring, isoniazid remains a major cause of acute liver failure due to idiosyncratic reactions, and is associated with several instances of acute liver failure and death or emergency liver transplanation in the United States each year.

How do you synthesis isoniazid?

Isoniazid can be synthesized in a two-step synthesis out of isonicotinic acid. First isonicotinic acid is turned into isonicotinic- acid-ethylester by an acid-catalyzed esterification with ethanol: At the beginning of the reaction the carbonylgroup is protonated by the acid, so the carbon gets more reactive.

Does isoniazid inhibit synthesis of mycolic acid?

The drugs shown to inhibit mycolic acid biosynthesis are isoniazid, ethionamide, isoxyl, thiolactomycin, and triclosan.

How does isoniazid work against TB?

Isoniazid is an antibiotic that is used to treat tuberculosis (TB). It works by killing the bacteria that cause the disease.

Why do TB patients take vitamin B6?

Vitamin B6 is used to prevent numbing and tingling of the hands or feet sometimes caused by isoniazid or other TB medicines. When should I take this? take the medicine.

What are symptoms of B6 deficiency?

Here are 9 signs and symptoms of vitamin B6 deficiency.

Why is isoniazid and rifampin given together?

Rifampin and isoniazid combination is used to treat tuberculosis (TB) infection. It may be taken alone or with one or more other medicines for TB. Rifampin belongs to the class of medicines called antibiotics and works to kill or prevent the growth of bacteria.

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