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LETTER
Year : 2008  |  Volume : 54  |  Issue : 3  |  Page : 245-246

Low-dose inhaled versus standard dose oral form of anti-tubercular drugs: Concentrations in bronchial epithelial lining fluid, alveolar macrophage and serum


Department of Tuberculosis and Respiratory Diseases, Dr. ML Chest Hospital, GSVM Medical College, Kanpur, India

Correspondence Address:
S Prakash
Department of Tuberculosis and Respiratory Diseases, Dr. ML Chest Hospital, GSVM Medical College, Kanpur
India
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Source of Support: None, Conflict of Interest: None


DOI: 10.4103/0022-3859.41823

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How to cite this article:
Katiyar S K, Bihari S, Prakash S. Low-dose inhaled versus standard dose oral form of anti-tubercular drugs: Concentrations in bronchial epithelial lining fluid, alveolar macrophage and serum. J Postgrad Med 2008;54:245-6

How to cite this URL:
Katiyar S K, Bihari S, Prakash S. Low-dose inhaled versus standard dose oral form of anti-tubercular drugs: Concentrations in bronchial epithelial lining fluid, alveolar macrophage and serum. J Postgrad Med [serial online] 2008 [cited 2022 Aug 8];54:245-6. Available from: https://www.jpgmonline.com/text.asp?2008/54/3/245/41823


Sir,

Patients with pulmonary tuberculosis could benefit from the use of inhaled anti-tubercular drug (ATD) administration as it would deliver the drug directly at the site of infection. [1] It is also likely that lower doses would be required when the drugs are administered by inhalation. [2]

A 'proof of concept' study was undertaken for comparing the concentrations of rifampicin (RIF), isoniazid (INH) and pyrazinamide (Z) in the epithelial lining fluid (ELF), alveolar macrophages (AM) and serum following low-dose administration via inhaled route and those following standard dose administration via oral route.

Following the approval of the Institutional Ethics Committee, healthy volunteers aged 20-50 years without prior history of tuberculosis and with baseline forced expiratory volume at 1 sec (FEV1) over 60% of predicted value for height, weight and gender were enrolled.

Informed consent was obtained prior to enrollment. The subjects were then randomized into two groups: Six subjects in Group A received capsule containing micro-particles of anti-tubercular drugs (ATD, INH 15 mg, RIF 30 mg and Z 75 mg with lactose as a carrier particle) using a dry powder inhaler. The particle size ranged from 1-10 µ with mass median aerodynamic diameter of 2.79 µ. The remaining six subjects in Group B received oral ATD (a tablet containing RIF 500 mg, INH 250 mg and Z 1250 mg) as a single dose at 8 h of fasting. As shown in [Table 1] the mean concentrations of INH, Z and RIF achieved in ELF were 220, 15 and 83 times higher in the inhaled group than those in the oral ATD group. Similarly, the median AM intracellular concentrations of INH, Z and RIF in inhaled group were 96, 29 and 113 times higher than those achieved in the oral group. The peak serum concentrations of INH, Z and RIF in the inhaled group were negligible and far lower than those for the oral group [Table 1].

As the first step, our study has demonstrated that inhaled ATDs attain appreciably higher levels in the ELF and AM as compared to orally administered drugs. Similarly, inhaled drug administration is associated with lower serum concentrations. Studies on multiple dose pharmacokinetics are required to further investigate our findings.


 :: Acknowledgment Top


  1. Lupin Pharmaceuticals, Inc., India for providing Pharmacopeial form of drugs
  2. Medispan pvt ltd., India for providing Drug manufacturing facility


 
 :: References Top

1.Pandey R, Khuller GK. Antitubercular inhaled therapy: Opportunities, progress and challenges. J Antimicrob Chemother 2005;55:430-5.  Back to cited text no. 1  [PUBMED]  [FULLTEXT]
2.Lipworth BJ. New perspectives on inhaled drug delivery and systemic bioactivity. Thorax 1995;50:105-10.  Back to cited text no. 2  [PUBMED]  [FULLTEXT]



 
 
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Online since 12th February '04
© 2004 - Journal of Postgraduate Medicine
Official Publication of the Staff Society of the Seth GS Medical College and KEM Hospital, Mumbai, India
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