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Metformin Hydrochloride Pill (Metformin Hydrochloride Tablets), also known as Metformin, Medecan, Gehuazhi, etc., is an oral hypoglycemic drug, belonging to biguanides. It is a first-line treatment drug for type 2 diabetes approved by the FDA. It is a type 2 diabetes drug with unsatisfactory diet control, especially for obese patients. It can be used alone or in combination with other hypoglycemic drugs such as sulfonylureas and insulin. It can be gradually increased to a maximum daily dose of 2 grams (8 tablets) based on blood glucose control, and the sustained-release tablet type can reduce gastrointestinal irritation and stabilize blood drug concentration.
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Metformin Hydrochloride Powder
Metformin Hydrochloride Pill
Additional information of chemical compound:
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Metformin Hydrochloride COA
The mainstream technology of Metformin Hydrochloride Pill: hydrophilic gel framework system
Metformin Hydrochloride Pill is the first-line drug for the treatment of type 2 diabetes. Its common preparation has limitations such as multiple daily administration, high incidence of gastrointestinal adverse reactions (about 30%), etc. The hydrophilic gel skeleton system controls the drug release through the physical barrier, achieving 1-2 doses per day and significantly improving patient compliance. This technology occupies over 65% of the global market share for metformin sustained-release formulations and has become the mainstream technology solution.
Technical background and drug characteristics
Pharmacological effects and clinical status of Metformin Hydrochloride
Metformin Hydrochloride Pill (metformin hydrochloride), as the representative of oral hypoglycemic agents of biguanides, has become the first-line drug for the treatment of type 2 diabetes (T2DM) worldwide since it was first used clinically in 1957. Its core mechanism of action includes:
Inhibition of hepatic glucose production
By inhibiting mitochondrial respiratory chain complex I, reducing hepatic gluconeogenesis and glycogen breakdown, and lowering basal blood glucose levels.
Enhance peripheral utilization
increase the uptake and utilization of glucose by muscles, fat and other tissues, and improve insulin sensitivity.
Delaying intestinal absorption
Inhibiting the absorption of glucose by intestinal wall cells and reducing postprandial blood glucose fluctuations.
Clinical studies have shown that Metformin can reduce glycated hemoglobin (HbA1c) by 1% -2% without gaining weight, and may even reduce weight while lowering the risk of cardiovascular events. Its safety is superior to other biguanide drugs (such as phenformin), and the incidence of lactic acidosis is significantly reduced.
Limitations of ordinary preparations
Traditional Metformin tablets have the following issues:
Short half-life
The plasma half-life is about 4-6 hours, requiring 2-3 doses per day, and poor patient compliance.
Gastrointestinal reactions
When taken on an empty stomach, drugs are rapidly released in the stomach, which may cause side effects such as nausea, vomiting, and diarrhea, with an incidence rate of up to 20% -30%.
Fluctuations in blood drug concentration
Multiple administrations can cause fluctuations in blood drug concentration peaks and valleys, which may increase the risk of hypoglycemia (although Metformin has a low risk of hypoglycemia when used alone, caution should be taken when combined with other medications).
In order to solve the above problems, sustained-release preparation technology emerged at the historic moment. Hydrophilic gel framework system has become the mainstream technology of Metformin sustained-release tablets because of its simple preparation process, low cost, stable drug release and other advantages.
Technical principle of hydrophilic gel framework system
The core of the hydrophilic gel framework system is the hydrophilic polymer, which hydrates after encountering water to form a thick gel layer, and controls drug release through diffusion and dissolution mechanisms. Common skeleton materials include:
Hydroxypropyl methylcellulose (HPMC): The most commonly used material, its viscosity grade (such as K4M, K15M, K100M) affects the drug release rate. HPMC with high viscosity forms a denser gel layer and releases drugs more slowly.
Polyethylene oxide (PEO): with a wide molecular weight range (100000 to 7 million), high molecular weight PEO is suitable for long-acting formulations.
Sodium alginate: natural polysaccharide, with good biocompatibility, often cross-linked with calcium ions to enhance the strength of gel.
Carbomer: cross-linked acrylic polymer, which forms high viscosity gel after absorbing water, suitable for low-dose drugs.
Drug release mechanism
The drug release process of hydrophilic gel matrix tablets can be divided into three stages:Hydration stage: after the tablet contacts with gastrointestinal fluid, the skeleton material surface absorbs water to form a gel layer.
Diffusion stage: the drug diffuses through the gel layer to the external medium, and the drug release rate depends on the thickness of the gel layer and the diffusion coefficient of the drug in the gel.Dissolution stage: with the continuous hydration of the gel layer, the skeleton material gradually dissolves, and the drug is diffused and released through the pores. The dissolution rate is influenced by material properties, pH value, and enzymes.
The drug release rate is affected by the following factors:
The properties of skeleton materials include viscosity, molecular weight, and degree of substitution (such as the ratio of hydroxypropyl and methoxy groups in HPMC).Drug properties: solubility, particle size, interaction with skeleton materials.Prescription factors: dosage of skeleton materials, type of excipients (such as pore forming agents, electrolytes).
Process factors: granulation method, tablet pressure, tablet hardness.
Dual control model for drug release mechanism
Diffusion control stage (0-4h): the drug diffuses through the pores of the gel layer, which conforms to the Higuchi equation: Q=√ (D ε/τ) √ (2A - ε) √ (t)
Typical parameters: diffusion coefficient D=1.2 × 10 ⁻⁶ cm ²/s, porosity ε=0.35
Dissolution control stage (4-12h): The dissolution rate of the skeleton surface is related to polymer degradation, following zero order kinetics, with a dissolution rate constant k=0.08 mg/cm ² · h (in pH 6.8 buffer solution)
Dual stage turning point control: By adjusting the ratio of HPMC to pore forming agents (such as lactose) (usually 3:1-5:1), a smooth transition from diffusion to dissolution is achieved.
Key technologies of Metformin Hydrochloride hydrophilic gel matrix sustained-release tablets
Prescription optimization strategy
Skeleton material selection matrix
| Drug properties | Recommended materials | Characteristics of drug release curve |
| High solubility (>100mg/mL) | HPMC K100M+Carbopol | Continuous release for 12 hours, peak to valley ratio<2 |
| Medium solubility (10-100mg/mL) | HPMC K4M+polyvinylpyrrolidone | 8-hour effective release, burst release effect<15% |
| Low solubility (<10mg/mL) | Sodium alginate+calcium carbonate | Requires the use of surfactants (such as SLS 2%) |
Functional auxiliary material ratio
Gel enhancer
When the CMC Na content is 5%, the gel strength increases by 60%
Floating agent
When the ratio of HPMC K4M to acrylic resin IV is 2:1, the floating retention time reaches 8h
Lubricant
If the amount of magnesium stearate exceeds 0.8%, the gel layer will break
preparation process
(1) Wet granulation and compression method
This is the most commonly used preparation method, with the following steps:
Mixing: Sift and mix Metformin, skeleton material, pore forming agent, etc.
Granulation: Add wetting agent (such as 60% -95% ethanol) to make soft material, sieve and granulate.
Drying: Wet particles are dried at 40-60 ℃ until the moisture content is ≤ 3%.
Whole granule: Dry granules are sieved and mixed with lubricant.
Tablet pressing: Control the hardness of the tablet (usually 50-100 N) to ensure drug release stability.
(2) Direct compression method
Suitable for drugs or excipients that are sensitive to dampness and heat and have good fluidity. Choose skeleton materials that can be directly compressed into tablets (such as pre gelatinized starch, microcrystalline cellulose) and control the particle size distribution.
(3) Process parameter control
Granulation endpoint: The particle size distribution of wet particles affects the quality of tablet compression and drug release rate. Coarse granules may lead to slow dissolution of tablets, while fine granules can easily produce fine powder, affecting the uniformity of content.
Drying temperature and time: High temperature or prolonged drying may cause degradation of the skeleton material or drug decomposition, and drying conditions need to be optimized.
Tablet pressing pressure: too high pressure may lead to densification of gel layer and slow drug release; If the pressure is too low, the hardness of the tablet will be insufficient and it will be easily broken.
Quality Control and Evaluation
Dissolution is the core indicator for evaluating the quality of sustained-release tablets. Usually, the paddle or basket method is used, with 0.1 mol/L hydrochloric acid solution or phosphate buffer solution (pH 6.8) as the medium, and the rotation speed is 50-100 rpm. The dissolution curve should meet the following requirements:
1-hour release dose: ≤ 30% (to avoid sudden release effects).
4-8 hour release dose: 50% -80% (continuous release).
12-24 hour release dose: ≥ 80% (complete release).
Verify the sustained-release effect by comparing the blood drug concentration time curves of sustained-release tablets and regular tablets. Ideally, sustained-release tablets should have lower Cmax (peak concentration), higher Tmax (peak time), and smoother AUC (area under the curve).
The accelerated test (40 ℃, 75% RH) and long-term test (25 ℃, 60% RH) showed that the hydrophilic gel matrix tablets may change the drug release rate due to aging of the matrix materials during storage. Therefore, it is necessary to choose a stable skeleton material and optimize the prescription.
Frequently Asked Questions
What is the difference between metformin and metformin hydrochloride?
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Metformin vs Metformin Hydrochloride: Similarities & Differences
A lot of people wonder about the difference between metformin vs metformin hydrochloride, and it is indeed confusing, but the answer is that metformin, metformin hydrochloride, and metformin HCl are the exact same medication. Hydrochloride is the salt form of metformin and of many other drugs on the market.
What is metformin SR 500 mg used for?
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Metformin SR 500 Tablet is used to treat type 2 diabetes. It contains Metformin, which works by decreasing the amount of glucose absorbed from the food and the amount of glucose made by the liver. It also increases the body's response to insulin, a natural substance that controls the amount of glucose in the blood.
Who should not take metformin hydrochloride?
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have ever had an allergic reaction to metformin or other medicine. have uncontrolled diabetes. have liver or kidney problems. have a severe infection.
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