First-Pass Metabolism Changes After Long-Term Garlic Supplementation

Background Morphine is metabolized to two major metabolites, morphine-3-glucuronide and morphine-6-glucuronide (M6G). Under the conditions of long-term oral morphine administration, the accumulation of M6G may contribute to the analgesic effects, but it may also cause respiratory depression. Methods Five healthy male volunteers (ages 25-34 yr) received 90 mg MST (morphine sulfate 5H2O sustained-released tablet, equivalent to 67.8 mg oral morphine). Multiple plasma and urine samples were taken for as long as 14 and 36 h, respectively. Individual pharmacokinetics after intravenous administration of morphine and M6G were available from a previous investigation. A new model that considers the M6G-plasma profile as a sum of the input from the first-pass metabolism of morphine and the input from systemically available morphine was applied to the plasma concentration versus time curves of M6G. The concentrations of M6G at the effect site after long-term morphine administration were simulated. Results The fraction of morphine absorbed from the gut was 82+/-14%. Of this, 42+/-8% passed through the liver, resulting in an oral bioavailability of morphine of 34+/-9%. Of the total amount of M6G, 71+/-7% was formed during the first-pass metabolism, and 29+/-7% was formed by metabolism of systemic morphine. After 36 h, the amounts of M6G and morphine excreted in the urine were 92+/-17% and 9+/-3%, respectively. Simulation of effect-site concentrations of M6G indicated that after multiple oral dosing of morphine in patients with normal liver and renal function, M6G might reach concentrations two times greater than that of morphine. Conclusions M6G may contribute to the analgesic and side effects seen with long-term morphine treatment. The current model of morphine and M6G pharmacokinetics after oral administration of morphine may serve as a pharmacokinetic basis for experiments evaluating the analgesic contribution of M6G with long-term oral dosing of morphine.

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REVIEW ON HERBAL LOZENGES PREPARED FOR COLD AND FLU.

Journal of Biomedical and Pharmaceutical Research ◽

10.32553/jbpr.v10i3.869 ◽

2021 ◽

Vol 10 (3) ◽

Author(s):

Darwhekar G. N ◽

Mudgal Kajal ◽

Koko Sweta. S

Keyword(s):

Traditional Medicine ◽

Retention Time ◽

Dosage Form ◽

Herbal Formulation ◽

First Pass Metabolism ◽

First Pass ◽

Care And Treatment ◽

Gastric Irritation ◽

Pass Metabolism

Traditional medicine and herbal formulation have been used by mankind for the care and treatment of various diseases and disorder. Throat infections are most common diseases in today’s world. However it is not taken too seriously by people long term throat infection can lead to severe throat problems pharyngitis and also cancer. The polyherbal lozenges are solid preparation that contains one or more medicaments usually during a flavored, sweetened base that are intended to dissolve or disintegrate slowly within the mouth. The benefits of they medicated lozenges is that they increase a retention time of the dosage form in mouth which increases bioavailability, reduces gastric irritation and bypasses first pass metabolism. Keywords: polyherbal lozenges, pharyngitis

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Identification of a Cranberry Juice Product Capable of Inhibiting Enteric CYP3A-Mediated First-Pass Metabolism in Humans

Planta Medica ◽

10.1055/s-2008-1075176 ◽

2008 ◽

Vol 74 (03) ◽

Author(s):

N Ngo ◽

Z Yan ◽

TN Graf ◽

DR Carrizosa ◽

EC Dees ◽

...

Keyword(s):

Cranberry Juice ◽

First Pass Metabolism ◽

First Pass ◽

Pass Metabolism

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Development, Characterization and Optimization of Mucoadhesive Tablet for Buccal Delivery of Domperidone

Drug Delivery Letters ◽

10.2174/2210303108666181108120840 ◽

2019 ◽

Vol 9 (1) ◽

pp. 37-49

Author(s):

Jagdale Sachin ◽

Panbude Aishwarya ◽

Navasare Priya

Keyword(s):

Drug Release ◽

Factorial Design ◽

Research Work ◽

Wet Granulation ◽

Buccal Delivery ◽

Scanning Calorimetry ◽

Mucoadhesive Polymers ◽

First Pass Metabolism ◽

First Pass ◽

Pass Metabolism

Background and Objective: Upon oral administration domeperidone is rapidly absorbed, but subjected to the first pass effect which lowers systemic bioavailability to 15%. Mucoadhesive tablet can remain attached to buccal mucosa and becomes capable of bypassing hepatic first-pass metabolism to improve absorption directly into systemic circulation. The present research work was carried with an aim to develop, evaluate and optimize mucoadhesive tablet containing domperidone (DOME) for buccal delivery using different bio-adhesive polymeric combinations. </P><P> Methods: The buccal tablets were formulated by wet granulation method using isopropyl alcohol. The preliminary formulations were prepared using combinations of HPMC K4, HPMC K15, HPMC K100, HPMC E5 as mucoadhesive polymers. 32 full factorial design was applied to determine the effect of independent variables like concentration of mucoadhesive polymers (HPMC K15 and HPMC K100) over dependent variables like mucoadhesive properties (swelling index, bioadhesive strength and in vitro drug release). The prepared mucoadhesive tablets were evaluated for their tablet properties and mucoadhesive properties. The interactions between drug and polymers were studied by Fourier Transform Infrared Spectroscopy (FTIR) and Differential Scanning Calorimetry (DSC). </P><P> Results: All formulations of factorial design showed satisfactory physicochemical, mechanical and bioadhesive characteristics. The formulation F9 exhibited maximum cumulative drug release, mucoadhesive strength and swelling index. Conclusion: The developed buccal tablet of domperidone might prove alternative to bypass the hepatic first pass metabolism and to avoid degradation which in turn may result in reducing the frequency of administration. Thus, mucoadhesive tablet of domeperidone may become viable alternative overcoming the side effects; achieving greater therapeutic effectiveness and improving the patient compliance.

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