Use of the drug Isoniazid in the treatment and prevention of tuberculosis in children.

"Inach" redirects here.
For "INAH" see Instituto Nacional de Antropología e Historia. Isoniazid

Clinical data
Trade namesHydra, Khizid, Izovit, others
Other namesIsonicotinic acid hydrazide, isonicotinylhydrazine, INHA
AHFS/Drugs.comMonograph
MedlinePlusa682401
License data
  • us DailyMed: Isoniazid
Pregnancy category
  • Australia: A[1]
  • us: C (risk cannot be excluded)[1][2]
Routes administrationInside, intramuscularly, intravenously
ATC code
  • J04AC01 (WHO) J04AC51 (WHO) J04AM01 (WHO) J04AM02 (WHO) J04AM03 (WHO) J04AM04 (WHO) J04AM05 (WHO) J04AM06 (WHO) J04AM07 (WHO) J04AM08 (WHO)
Legal status
Legal status
  • us: ℞-only
Pharmacokinetic data
Protein bindingVery low (0–10%)
Metabolismliver; CYP450: inhibitor of 2C19, 3A4
Elimination of half-life0.5–1.6 h (fast acetylators), 2-5 h (slow acetylators)
Excretionurine (mainly), feces
Identifiers
IUPAC name
  • Pyridine-4-carbohydrazide
Number of CAS
  • 54-85-3 Y
PubChem C.I.D.
  • 3767
DrugBank
  • DB00951Y
ChemSpider
  • 3635 Y
UNII
  • V83O1VOZ8L
KEGG
  • D00346 Y
  • C07054Y
CHEBY
  • CHEBI: 6030 Y
CHAMBL
  • ChEMBL64 Y
NIAID ChemDB
  • 007657
CompTox Control Panel (EPA)
  • DTXSID8020755
ECHA InfoCard100.000.195
Chemical and physical data
FormulaC6H7N3O
Molar mass137.142 g mol−1
3D model (JSmol)
  • Interactive image
Smiles
  • C1=CN=CC=C1C(=O)NN
InCHI
  • InChI = 1S / C6H7N3O / c7-9-6 (10) 5-1-3-8-4-2-5 / h1-4H, 7H2, (H, 9,10)Y
  • Key: QRXWMOHMRWLFEY-UHFFFAOYSA-N Y
(check)

Isoniazid

, also known as
isonicotinic acid hydrazide
(
INH
), is an antibiotic used to treat tuberculosis.[2]
For active tuberculosis, it is often used together with rifampicin, pyrazinamide, and either streptomycin or ethambutol.[3] For latent tuberculosis, it is often used on its own.[2] It can also be used for atypical species of mycobacteria, such as M. avium
,
M. kansasii
, and
M. xenopi
.[2] It is usually taken orally, but may be injected into a muscle.[2]

Common side effects include increased levels of liver enzymes in the blood and numbness in the arms and legs.[2] Serious side effects may include liver inflammation and acute liver failure.[2] It is unclear whether use during pregnancy is safe for the baby.[4] It is probably safe to use during breastfeeding.[4] Pyridoxine may be given to reduce the risk of side effects.[5] Isoniazid works partly by interfering with the formation of bacteria. cell wall which leads to cell death.[2]

Isoniazid was first produced in 1952.[6] It is on the World Health Organization's List of Essential Medicines.[7] The World Health Organization classifies isoniazid as critically important for human medicine.[8] Isoniazid is available as a generic drug.[2]

Contraindications

The use of Isoniazid is contraindicated, regardless of the route of administration, in case of intolerance to the drug, epilepsy and other diseases accompanied by a tendency to seizures, in the case of previous polio, impaired renal and liver function, severe atherosclerosis.
The use of the drug in a dose of more than 10 mg/kg is contraindicated during pregnancy, pulmonary heart failure of the III degree, hypertension of the II-III degree, coronary heart disease, widespread atherosclerosis, diseases of the nervous system, bronchial asthma, psoriasis, eczema in the acute phase, cirrhosis of the liver , myxedema. Intravenous administration of isoniazid is also unacceptable for phlebitis.

Story

The first synthesis was described in 1912. A. Kachugin invented a drug against tuberculosis called Tubazid. Three pharmaceutical companies simultaneously tried unsuccessfully to patent the drug,[43] most notably Roche, which released its version of Rimifon in 1952.[44] With the advent of isoniazid, a cure for tuberculosis was first considered possible.

The drug was first tested in many farms, a Navajo community in Arizona, due to the problem of tuberculosis on the Navajo Reservation and because the population had not previously been treated with streptomycin, the main treatment for tuberculosis at the time.[45] The study was led by Walsh McDermott, an infectious disease researcher with an interest in public health who had previously taken isoniazid to treat his own tuberculosis.[46]

Isoniazid and its related drug, iproniazid, were among the first drugs to be called antidepressants.[47]

Directions for use and doses

Isoniazid is used intravenously, intramuscularly, in the form of inhalations, and possibly intracavernous administration. The daily and course doses of isoniazid are set for each patient individually, depending on the nature and form of the disease, the degree of inactivation and tolerability of the drug.

Intravenous isoniazid is administered for the treatment of widespread pulmonary tuberculosis, with massive bacterial excretion, concomitant diseases of the gastrointestinal tract, and in patients who avoid taking the drug orally. Adults and adolescents are administered slowly in drops of 10-15 mg per 1 kg of body weight per day. The course of treatment, depending on the effectiveness of therapy and tolerability of the drug, is 30-50 infusions. To prevent side effects when administering isoniazid intravenously, vitamin B6 (pyridoxine) and glutamic acid are used. Pyridoxine is administered intramuscularly 100-125 mg 30 minutes after administration of Isoniazid, or prescribed orally 60-100 mg every 2 hours after intravenous administration of Isoniazid. Glutamic acid is taken in a daily dose of 1 to 1.5 g. After intravenous administration of the drug, bed rest is required for 1-1.5 hours.

Adults and adolescents are administered intramuscularly in a 10% solution at 5-12 mg/kg per day for 2-5 months. To reduce the side effects of this route of administration, pyridoxine is prescribed orally along with the administration of Isoniazid at a dose of 60-100 mg (can also be administered intramuscularly 30 minutes after Isoniazid at a dose of 100-125 mg/kg).

In order to reduce side effects, in addition to the above-mentioned pyridoxine and glutamic acid, 1 ml of thiamine bromide (6% solution) or thiamine chloride (5% solution) is administered intramuscularly, and the sodium salt of ATP is prescribed.

Inhalation isoniazid is prescribed in 1-2 doses in a 10% solution.

The daily dose is 5-10 mg per 1 kg of body weight. Inhalations are used daily for 1-6 months.

Mainly for adults with fibrous-cavernous and cavernous forms of tuberculosis, with bacterial excretion and in the preoperative period, a 10% solution of the drug in a daily dose of 10-15 mg/kg is administered intracavernously.

Isoniazid[edit | edit code]

Isoniazid (isonicotinic acid hydrazide) remains the mainstay of treatment for tuberculosis. If well tolerated, isoniazid is prescribed to all patients with tuberculosis (provided that the pathogen is sensitive to the drug).

Historical background[edit | edit code]

Isoniazid was discovered almost by accident. In 1945, Shorin showed that nicotinamide has a bacteriostatic effect on Mycobacterium tuberculosis. Further research revealed that many pyridine derivatives, including isonicotinic acid derivatives, have the same effect. Knowing that thiosemicarbazones also inhibit the growth of Mycobacterium tuberculosis, scientists attempted to synthesize isonicotinic aldehyde thiosemicarbazone. The starting material for the synthesis was isonicotinic acid methyl ester, and the first intermediate product was isonicotinic acid hydrazide, that is, isoniazid. The history of this interesting discovery is given in a review by Fox (1953).

Chemical properties[edit | edit code]

Isoniazid is isonicotinic acid hydrazide. Its structural formula is as follows:

Structural formula of isoniazid

The isopropyl derivative of isoniazid, and proniazid (1-isonicotinyl-2-isopropylhydrazide), also inhibits the growth of Mycobacterium tuberculosis. Being a powerful MAO inhibitor, iproniazid was not used as an anti-tuberculosis drug due to its side effects, but became the founder of one of the groups of antidepressants (Chapter 19).

Antimicrobial activity[edit | edit code]

Isoniazid has a bacteriostatic effect on resting mycobacteria, and a bactericidal effect on rapidly dividing mycobacteria; The MIC is 0.025-0.05 μg/ml. Before reproduction stops, mycobacteria have time to undergo one or two divisions. Isoniazid is highly selective against mycobacteria; The MIC for other microorganisms exceeds 500 μg/ml.

In animal experiments, isoniazid was much more effective than streptomycin. Unlike the latter, isoniazid easily penetrates cells and has an equally good effect on mycobacteria located intra- and extracellularly.

Among atypical mycobacteria, only Mycobacterium kansasii is usually sensitive to isoniazid. However, in any case, it is necessary to determine the degree of sensitivity of the pathogen, since the MIC can be quite high.

Stability[edit | edit code]

Cultivation of Mycobacterium tuberculosis in the presence of increasing concentrations of isoniazid leads to the rapid selection of resistant strains capable of growing even at very high concentrations of the drug. Cross-resistance to other anti-tuberculosis drugs is not typical (the exception is ethionamide, since it is structurally similar to isoniazid). The main mechanism of resistance is mutation of the gene encoding the bacterial enzyme catalase-peroxidase. A defect in this enzyme prevents the conversion of isoniazid to the active metabolite (Blanchard, 1996). Another mechanism of resistance is due to a missense mutation in the bacterial inhA gene, responsible for the synthesis of mycolic acids (Baneijee et al., 1994).

Mutations that cause resistance to isoniazid occur with a probability of approximately 1 in 106, and since the tuberculosis cavity contains many more pathogens (10 -10 ), against the background of isoniazid monotherapy (as with any other anti-tuberculosis drug), a rapid selection of resistant strains occurs. Sometimes an initially sensitive strain is replaced by a resistant strain within just a few weeks of treatment. In the United States, until recently, the prevalence of primary resistance of Mycobacterium tuberculosis to isoniazid remained at 2-5%. Now this figure has increased to 8%. Moreover, in large cities, coastal and border areas, and in some populations among Asians and Hispanics, it may be much higher (Centers for Disease Control and Prevention, 1999; Iseman, 1993).

Interaction with other drugs

If necessary, isoniazid is prescribed in combination with other anti-tuberculosis drugs - antibiotics, sulfonamides (except cycloserine).

With the simultaneous use of Isoniazid with drugs that have hepatotoxic properties, the likelihood of hepatotoxic reactions increases. When used simultaneously with rifampicin, the risk of developing these reactions increases (especially in people with impaired liver function and in patients with alcoholism). When used simultaneously with paracetamol, the risk of hepatotoxicity increases. With the simultaneous use of isoniazid with carbamazepine or phenytoin, the metabolism of the latter is suppressed, which leads to an increase in their concentrations in the blood plasma and increased toxic effects. To prevent the development of these phenomena, pyridoxine and glutamic acid are prescribed.

Cautions

Simultaneous consumption of alcohol increases hepatotoxic reactions.

Mechanism of action[edit | edit code]

Already in 1975, it was suggested that isoniazid inhibits the synthesis of mycolic acids, an important component of the mycobacterial cell wall (Takauata et al., 1975). Mycolic acids are found only in mycobacteria, so isoniazid has no effect on other microorganisms. The mechanism of action of isoniazid is complex; Resistance to the drug may be based on mutations in at least five bacterial genes (katG, inhA, ahpC, kasA and ndh). According to numerous data, the main target of isoniazid is the product of the inhA gene, an enoyl (acyl transfer protein) reductase involved in the synthesis of mycolic acids. This enzyme is part of fatty acid synthase II and converts D2-unsaturated fatty acids into saturated fatty acids (Vilcheze et al 2000). Isoniazid disrupts the synthesis of mycolic acids; in the cell wall the content of lipids extractable with methanol decreases, and mycobacteria lose acid resistance.

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