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In Vitro Quality Assessment of Glibenclamide Tablets: Reference, Generic and Similar Drugs

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10 September 2024

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12 September 2024

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Abstract
Introduction: Pharmaceutical tablets are solid forms administrated orally and they constitute 80% of the market because of its best stability and ease of large-scale production, adherence and treatment. The Brazilian Legislation establishes that for a drug to be registered as a similar or generic drug is necessary to verify the pharmaceutical equivalence in relation to the reference drug, indicated by ANVISA, through quality control tests, ensuring that the drug is approved with satisfactory quality. Objective: to evaluate the reference, generic and similar glibenclamide tablets through quality control tests, comparing the results with each other and relate clinical impacts on the patient in the face of changes in the quality control of medicines. Methodology: tests of average weight, friability and disintegration were done, according to the Brazilian Pharmacopoeia VI Edition, in uncoated tablets of Glibenclamide 5mg Reference (Daonil), Generic (Glibenclamide) and Similar (Glionil), and the results obtained were compared with the that advocates the scientific literature. Results: Data referring to the average weight: Reference 0.1591g, Generic 0.1002g and Similar 0.0996g; For friability: Reference value 0.54%, Generic value 0.49% and Similar value 0.28%. The disintegration tests showed the following times: Reference 35 seconds, Generic 29 seconds and Similar 33 seconds. Conclusion: the tests to which the glibenclamide tablets were submitted showed results within the parameters established by the Brazilian Pharmacopoeia.
Keywords: 
Glibenclamide
;  
diabetes mellitus
;  
quality control
;  
drug
;  
in vitro
;  
pharmacopoeia
Subject: 
Medicine and Pharmacology  -   Pharmacy

1. Introduction

Tablets are solid forms administered orally and they constitute 80% of the market because of its best stability and ease of large-scale production, adherence and treatment (Arshad et al. 2021). These dosage forms may vary in size, shape, weight, hardness, thickness, disintegration and solution characteristics, among other aspects, depending on their intended use and method of manufacture. Therefore, to ensure compliance and quality assurance, it is important to carry out tests on the finished product, which are important to verify the exact dose of the drug in the pharmaceutical form and to check if the packaging guarantees its stability, what guarantees efficacy and treatment of the patient (Krauser et al. 2020; Pinto et al. 2015, Machado et al. 2021).
The quality control is part of Good Manufacturing Practices and it ensures the quality of a drug before it is released to the market. Thus, pharmacopoeias present standard tests and equipments, along with basic characteristics that must be followed to maintain the drug quality control. In this sense, diabetes mellitus affect approximately 3% of the world population and it is among the most commom diseases in Brazil, the 5th country in incidence of diabetes in the world, in 2021, with 16.8 million adult patients (20 to 79 years old) and approximately 7.6% of the Brazilian population, thus having a large medicine dispensing for their treatment (Moisés, 2006; Guariguata et al. 2014; Abubakar et al. 2015; Coridiola; Pelegrini, 2016; SBD, 2019; Brasil, 2019). Thus, the high prevalence of diabetes mellitus and its complications demonstrate the need for investments in its prevention, on the disease control and the longitudinal care (Iser et al. 2015; Flor; Campos, 2017).
Thus, among the most used antidiabetics, Glibenclamide stands out, a second-generation hypoglycemic drug, administered in the form of a tablet, orally, for the treatment of type 2 diabetes mellitus. This drug belongs to the class of Sulphonylureas and its mechanism of action is related to the increase in insulin secretion, as they act on the pancreatic beta cells, which normalizes carbohydrate metabolism. This drug is available by the Brazilian Popular Pharmacy Program, accessible to diabetic patients who use the Unified Health System. Then, the registration of this generic drug, in 2001, resulted in 35% savings for the consumer when comparing its value with the reference drug (Brasil, 2001; Rang;Dale, 2016).
Thus, drugs can have three classifications: reference, similar and generic. In 2003, RDC nº 134 established criteria for the adequacy of similar drugs already marketed in Brazil, so that companies had to present studies that proved the therapeutic equivalence between the similar registered drug and its respective reference drug. Thus, the generic and similar equivalent are interchangeable with the innovator, when their patent protection period expires. This interchangeability is recognized through the performance of bioequivalence tests, carried out by laboratories accredited by ANVISA. The generics must have the same drug, same amount and pharmaceutical form as the reference drug, being a pharmaceutical equivalent of the innovative drug, while the similar equivalent differs only in the size of the product, packaging, labeling and excipients (Brasil, 1999; Messa et al. 2014; Medeiros et al. 2019).
In this way, quality control is an important part of Good Manufacturing Practices (GMP) and must ensure that a drug is approved only when its quality parameters are in accordance with the provisions of the Pharmacopoeias. Thus, it is essential to carry out physicochemical quality control tests of glibenclamide tablets in different pharmaceutical specialties to verify that the analyzed samples are in accordance with the Brazilian Pharmacopoeia to guarantee the expected pharmacological effect (Brasil, 2001).
Therefore, the present work aims to evaluate the reference, generic and similar tablets of glibenclamide through quality control tests, comparing the results with each other and relating the possible clinical impacts on the patient in the face of changes in the quality control of medicines.

2. Materials and Methods

2.1. Samples

Uncoated tablets containing 5 mg of glibenclamide were purchased at Pague Menos Drugstore, in Várzea Grande, Mato Grosso. To carry out the quality control tests, the samples were divided into three groups of 78 tablets each (Table 1). All tests were performed in triplicate at the Quality Control laboratory of the Centro Universitário de Várzea Grande (UNIVAG).
Thus, the samples were separated, removing them from their primary and secondary packaging to place them in a beaker. Each beaker was identified with “reference”, “generic” and “similar”.

2.2. Quality Control of Glibenclamide Tablets

2.2.1. Determination of Average Weight

Twenty tablets of each pharmaceutical specialty (n=20) were individually weighed, in triplicate, on an analytical balance (Astral Científica) to calculate the mean weights and standard deviation, tolerating no more than two units outside the specified limits. For tablets weighing between 80 and 250 mg, the weight variation allowed is +/- 7.5% in relation to the average weight. However, no sample must contain unit weight above or below twice the percentages indicated by the Brazilian Pharmacopoeia, 6th Edition (de Oliveira Alves et al. 2017; Brasil, 2019)

2.2.2. Determination of Friability

Twenty tablets of each pharmaceutical specialty (n=20) were used and introduced into a friabilometer, which rotates around its axis at a speed of 25 ± 1 rotations per minute. With 100 rotations performed, that is, 4 minutes, the tablets were removed from the equipment and weighed again, after removing any powder residue from the tablets. No tablet, at the end of the test, can be broken, chipped, cracked or broken, and this evaluation is performed visually. Thus, friability was calculated as the difference between the initial weight and the final weight of the tablets, which is measured as a function of the percentage of powder lost. Samples with a loss equal to or less than 1.5% of their weight were considered approved in the test (Brasil, 2019).

2.2.3. Disintegration Test

This test was performed in triplicate, with the aid of an oscillating tube device (Disintegrator Mod. 301-AC), where 6 tablets of each pharmaceutical specialty (n=6) were distributed in transparent tubes contained in a basket of the equipment, adding the discs in each tube to ensure that the pills remained retained from the bottom of the basket. The basket with the respective samples was transferred to the device support and subjected to vertical movements in a liquid medium with 800 ml of distilled water maintained by the thermostat at 37º ± 1ºC, until the complete disintegration of the tablets or a maximum of 30 minutes each. At the end of the test, no residue from the tested units should remain on the metal screen of the disintegration device (Brasil, 2019).

3. Statistical Analysis

The results of the parametric tests were expressed in terms of mean ± standard error (S.E.M.). To compare more than two means, one-way analysis of variance (ANOVA) was used, and when there was statistical significance, it was followed by Student-Newman-Keuls multiple comparison test and column statistics, using the GraphPad Prism 5.0 software. Values of p < 0.05 were considered statistically significant.

4. Results

4.1. Determination of Average Weight

Thus, the average weight test of Reference, Generic and Similar tablets (n=20) were, respectively, 0,1591, 0,1002 and 0,0996g, and its results were presented by the mean of the values found (Figure 1). It was possible to observe that the Generic and Similar tablets were lighter by 37.02% and 37.40% (p < 0.001), respectively, when compared to the Reference drug.
Thus, among the pills evaluated, it was observed that the highest weights found for the Reference (Daonil), Generic (Glibenclamide) and Similar (Glionil) pills were, respectively, 0.1644g, 0.1017g and 0.1034g, respectively, while the less weights obtained, in the same order, were 0.1512g, 0.0948g and 0.0983g (Figure 2), thus, they are all in the range that correspond to tablets weighing 80 to 250 mg with a variation limit of ± 7.5% from the average weight, according to the Brazilian Pharmacopoeia, 6th Edition (Brasil, 2019, Pereira et.al. 2020).

4.2. Determination of Friability

The Glibenclamide tablets (n=20) were submitted to a friabilometer and to recognize if there was a loss of mass of the tablets, they were weighed before and after submitting them to the friability test. The weight loss of the reference, generic and similar pills was, respectively, 0.54%, 0.49% and 0.28% (Figure 3), with no statistical difference or standard deviation.

4.3. Disintegration Test

The disintegration time intervals required for the Reference, Generic and Similar Glibenclamide tablets were, respectively, 35 seconds, 29 seconds and 33 seconds (Table 2). Thus, they remained within the 30-minute interval, as recommended in the Brazilian Pharmacopoeia, 6th edition.

5. Discussion

The quality of Glibenclamide 5 mg Reference (Daonil), Generic (Glibenclamide) and Similar Interchangeable (Glionil) medicines was analyzed. The three pharmaceutical specialties were subjected to tests of average weight, friability and tablet disintegration, and all presented results within the parameters established by the Brazilian Pharmacopoeia, 6th Edition (Brasil, 2019, Abebe et al. 2020).
According to RDC No. 301 of August 21, 2019, quality control is the execution of relevant and necessary tests, which guarantee the safety and effectiveness of the product. For these tests to be released for commercialization or distribution, their quality must be considered satisfactory (Brasil, 2019). The weight assessment test analyzes the uniformity of weight between the units of the same batch and proves whether the amount of the active ingredient declared by the laboratory is within the acceptable variation limit, determined by the Brazilian Pharmacopoeia (Costa; Gomes, 2017).
Thus, the determination of average weight was performed in triplicate with the Reference, Generic and Similar tablets (n=20) and their weights had a statistical difference, when compared to the reference drug.
The friability test, according to the Brazilian Pharmacopoeia, is applied only to uncoated tablets, and a loss of less than 1.5% of their weight are acceptable, while those that are chipped or that separate into layers are not considered (Brasil, 2019). Thus, none of the tablets evaluated at the end of the test was cracked or broken, however, two tablets (Reference) broke when removed from the blister, and were discarded from the tests. Therefore, none showed a loss of 1.5%, a limit established by the Brazilian Pharmacopoeia, 6th Edition (Brasil, 2019).
In the disintegration test, the time required for the tablets to completely disintegrate is evaluated. This test seeks to reproduce, in vitro, the release of the active ingredient from the tablets that occurs in the gastrointestinal medium and needs to disintegrate into small particles, increasing the contact surface with the medium and facilitating its absorption by the body, which is directly linked to the bioavailability and therapeutic action of the drug (Pereira et al. 2020).
Low quality medicines can result in treatment failure, which justifies the need for continuous evaluation of the effectiveness of medicines that circulate in the market, having main importance with the therapy used in the treatment of chronic diseases, such as diabetes, for which daily therapy long term is mandatory. According to Johnston and Holt (2014), the quality of medicines is not only commercial, but also legal, ethical and moral, because when there are failures to comply with quality specifications considered essential, there can be implications, such as lack of clinical response and, consequently, the loss of trust in the health system and in the regulatory authority (Abebe et al. 2020).
According to the studies by Nogueira et al. (2020), clinical and educational interventions related to pharmaceutical care have a significant impact on the type 2 diabetes mellitus control. Therefore, according to all the results obtained with the glibenclamide tablets tested, except the determination of average weight, there was no significant difference between the reference, generic and similar drugs, and all of them presented acceptable values for Brazilian legislation, which also corroborates the studies carried out by Magalhães et al. (2021), which resulted in similar values in relation to the Reference and Similar Glibenclamide tablets, which presented, respectively, the average weight of 0.159g and 0.100g, friability of 0.37% and 0.59%, and disintegration time of 34 seconds and 57 seconds.

6. Conclusion

In this study, it was possible to evaluate the quality of Glibenclamide tablets, through tests of average weight, friability and drug disintegration. Thus, the results of all analyzed samples were similar to the reference product and, thus, they were within the standard established by the Brazilian Pharmacopoeia, 6th edition, with the exception of two tablets of the reference drug that broke when removed from the blister, and were discarded.
Thus, the research carried out demonstrates the importance of quality control tests, as they guarantee the effectiveness and safety of medicines and it is ideal for the tablets to present the parameters determined by the literature to guarantee better results in the health and quality of life of the patient, in addition to improve the treatment adherence for type 2 diabetes mellitus. Therefore, this study ensures that the analyzed generic and similar drugs can be used interchangeably in clinical practice.

References

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Figure 1. Average weight of reference, generic and similar glibenclamide tablets (n=20), in triplicate, in Astral Científica balance. The weight difference was expressed as Mean ± Standard Error (S.E.M.). One-way ANOVA, followed by the Student Newman-Keuls test. ***p < 0.001 vs. reference.
Figure 1. Average weight of reference, generic and similar glibenclamide tablets (n=20), in triplicate, in Astral Científica balance. The weight difference was expressed as Mean ± Standard Error (S.E.M.). One-way ANOVA, followed by the Student Newman-Keuls test. ***p < 0.001 vs. reference.
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Figure 2. Weights of A) reference, B) generic and C) similar glibenclamide tablets (n=20), in triplicate, in Astral Científica balance, compared with the variation limit of ± 7.5% from the average weight.
Figure 2. Weights of A) reference, B) generic and C) similar glibenclamide tablets (n=20), in triplicate, in Astral Científica balance, compared with the variation limit of ± 7.5% from the average weight.
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Figure 3. Results of the difference in weight of the reference, generic and similar glibenclamide tablets (n=20) submitted to the friability test performed in triplicate for 4 minutes at a speed of 25 ± 1 rotations per minute. The weight difference (%) was expressed as Mean ± Standard Error (S.E.M.), by column statistics.
Figure 3. Results of the difference in weight of the reference, generic and similar glibenclamide tablets (n=20) submitted to the friability test performed in triplicate for 4 minutes at a speed of 25 ± 1 rotations per minute. The weight difference (%) was expressed as Mean ± Standard Error (S.E.M.), by column statistics.
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Table 1. groups of reference (Sanofi), generic (Neoquímica) and similar (Neoquímica) drugs used for quality control tests in the UNIVAG laboratory.
Table 1. groups of reference (Sanofi), generic (Neoquímica) and similar (Neoquímica) drugs used for quality control tests in the UNIVAG laboratory.
Drug Laboratory Lots
Reference (Daonil) Sanofi ARA06380 and ARA06380
Generic (Glibenclamide) Neoquímica B20L0198, B21A1590 and B21E2248
Similar (Glionil) Neoquímica B20L1049 and B20L1047
Table 2. Results of the disintegration test of glibenclamide tablets (n=6) performed in triplicate in Disintegrator Mod. 301-AC (S = seconds. (*) = Accepted value according to the Brazilian Pharmacopoeia, VI ed. < 30 minutes).
Table 2. Results of the disintegration test of glibenclamide tablets (n=6) performed in triplicate in Disintegrator Mod. 301-AC (S = seconds. (*) = Accepted value according to the Brazilian Pharmacopoeia, VI ed. < 30 minutes).
Sample Disintegration time Conclusion*
Reference 35s Approved
Generic 29s Approved
Similar 33s Approved
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