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Albendazole suspension 10ml is an oral antiparasitic preparation specifically designed for pediatric and dysphagic patients. This viscous, often flavored liquid formulation contains micronized albendazole particles (typically 200mg/5ml) suspended in a palatable base, addressing the swallowing difficulties posed by tablets. Its key advantage lies in precise dose adjustability for weight-based pediatric dosing, though studies reveal significant dosing errors due to inconsistent measuring devices (e.g., household spoons vs. oral syringes). The suspension's bioavailability depends critically on shaking homogeneity – sedimentation analyses show up to 30% potency variation in undisturbed bottles. Unlike tablets, its formulation avoids crospovidone but requires parabens or sorbitol as stabilizers, raising concerns in phenylketonuria patients. Recent pharmacovigilance data highlights its underreported role in mass deworming programs, where rapid administration logistics compromise dosing accuracy. A 2023 Nigerian study demonstrated that tropical heat exposure accelerates API degradation by 1.8x compared to tablet forms.
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Physical and Chemical Properties
Appearance and Properties
Albendazole Suspension 10ml is a fine-particle suspension solution. After standing, the fine particles settle, and after shaking, it forms a uniform white or off-white suspension with a slight odor. Its core component, albendazole, is a white to pale yellow crystalline powder. Its melting point is 207-211°C (decomposes). It is slightly soluble in acetone or trichloromethane, almost insoluble in ethanol, insoluble in water, but soluble in glacial acetic acid.
Stability and Storage Conditions
This suspension solution needs to be stored in a sealed container. The shelf life is usually 2 years. Studies have shown that the albendazole nano-suspension prepared by the reverse solvent method and high-pressure homogenization method shows no significant changes in appearance, color, content, pH value, sediment volume ratio, and re-dispersibility during the 6-month accelerated test, demonstrating good stability.
Particle Size and Bioavailability
The median particle size of the nano-suspension is 358.1 nm, significantly smaller than that of traditional preparations. The single-dose oral experiment in rats shows that the Cmax of the nano-suspension (5.895 μg/mL) is significantly higher than that of the reference preparation (2.804-2.053 μg/mL), with a relative bioavailability increase of 214%-299.74%. This indicates that nanotechnology can significantly improve the absorption efficiency of albendazole and enhance clinical efficacy.
Pharmacological Mechanism
Antiparasitic Spectrum
Albendazole Suspension 10ml has a strong killing effect on nematodes, tapeworms, and flukes, but is ineffective against schistosomes. Its mechanism of action is by binding to the microtubulin protein of parasites, preventing the polymerization of microtubules, thereby interfering with the mitosis, protein assembly, and energy metabolism of the parasites, ultimately leading to their death.
Coverage of Insecticidal Stages
This drug not only has a strong effect on adult parasites, but also has significant killing effects on immature parasites and larvae, and has larvicidal efficacy. For example, the elimination rate of pig roundworm and posterior roundworm adult parasites is over 98%, and the elimination rate of sheep blood-sucking nematode and Ostertagia lineolata adult parasites is ≥ 95%.
Host Safety
The affinity of albendazole to the microtubulin protein of parasites is significantly higher than that of mammals, so the toxicity to the host is lower. However, it should be noted that the use during the early stage of pregnancy in animals may cause teratogenicity and embryotoxicity, and it is prohibited during lactation. The use in pregnant animals during the 45 days before the pregnancy is cautious.
Pharmacokinetic Characteristics
Absorption and Distribution
Traditional albendazole preparations have low solubility and strong first-pass effect, resulting in a low absorption rate in the gastrointestinal tract. However, the nano-suspension significantly improves the solubility and absorption efficiency of the drug in the gastrointestinal tract by reducing particle size and increasing surface area.
Metabolism and Excretion
Albendazole is metabolized into sulfoxide or sulfone compounds in the body, mainly by inhibiting the parasite's absorption of glucose and the fumaric acid reductase system, blocking ATP production, and preventing the parasite from surviving. Its metabolites are excreted in feces, and the withdrawal period varies depending on the animal species (14 days for cattle, 4 days for sheep, 7 days for pigs, and 4 days for poultry).
Drug Interactions
Combining with levamisole can increase the bioavailability of albendazole and enhance the anthelmintic effect. This characteristic provides a theoretical basis for clinical combination therapy.
Preparation Process and Quality Control
Preparation Method
The preparation of Albendazole Suspension requires strict control of process parameters. For example, the preparation of nano-suspension uses the reverse solvent method and high-pressure homogenization method, adding a high-molecular active agent as a stabilizer to ensure uniform distribution of the drug particle size.
Quality Standards
According to the "Chinese Veterinary Drug Quality Standard (2017 Edition)", the suspension solution must meet the following requirements:
Content: 90.0%-110.0% of the labeled amount
pH value: 5.0-7.0
Sediment volume ratio and re-dispersibility: in accordance with the regulations for oral suspension preparations Identification: Verification was conducted through ultraviolet spectrophotometry (with the maximum absorption at a wavelength of 295 nm) and chemical color reaction (such as the formation of a red-brown precipitate when potassium iodobismuthate solution is added).
Clinical Application Advantages
Appetite and Administration Convenience
The suspension formulation can be directly absorbed by the gastrointestinal tract, reducing feeding stress and supporting multiple administration methods such as direct feeding, mixing with food, or drinking water. It is particularly suitable for pets and large-scale farms.
Broad-spectrum Deworming and Cost-effectiveness
This preparation can effectively eliminate common parasites such as roundworms, hookworms, tapeworms, whipworms, and flukes, reducing the decline in daily weight gain (8-15%), deterioration of feed conversion rate (5-10%), and mortality risk (an increase of 15% in calf mortality) caused by parasitic infections, significantly improving the economic benefits of breeding.
Safety and Tolerance
The toxicity to mammals is low, and adverse reactions are rare. However, strict adherence to the withdrawal period is required to avoid drug residue exceeding the limit.
The problem of sedimentation caused by improper storage
Formation Mechanism: Dual Challenges of Physical and Chemical Stability
As an aqueous suspension formulation, Albendazole Suspension 10ml, whose core component is Albendazole, has an extremely low solubility in water (only 0.016 mg/mL, at pH 6.0 and 24°C conditions). It requires the addition of stabilizers (such as xanthan gum, sodium carboxymethyl cellulose) to maintain physical stability. When storage conditions are improper (such as temperature fluctuations, exposure to light, or failure of sealing), the following mechanisms will lead to the formation of precipitation:
Stabilizer failure
Xanthan gum provides the best stability at a concentration of 0.2% - 0.3%, but if the storage temperature exceeds 30°C or is exposed to light for a long time, its molecular chains may break, resulting in a decrease in viscosity and a reduction in sediment volume ratio. For example, the formulation containing 0.3% xanthan gum remains stable after storage at room temperature for 4 months, while the formulation containing 1% sodium carboxymethyl cellulose shows hard precipitation due to insufficient suspension capacity.
Particle aggregation
The surface charge of albendazole particles is significantly affected by pH. Within the pH range of 5.0 - 7.0, the particles carry a negative charge and maintain a dispersed state through electrostatic repulsion; if the storage environment has a high humidity that causes a decrease in pH, the particle charge decreases, and aggregation and precipitation are prone to occur.
Chemical degradation
Albendazole is sensitive to light. After being exposed to light in the solution for 10 hours, its content can decrease by more than 30%. The degradation products may change the surface properties of the particles, promoting flocculation and precipitation.
Common scenarios of improper storage and sedimentation characteristics
Temperature control issues
High-temperature environment (e.g., summer without refrigeration): The viscosity of the suspending agent decreases, accelerating the settling speed of particles, forming loose sedimentation that can be redispersed after shaking.
Low-temperature environment (e.g., winter refrigeration): If the formulation contains humectants such as glycerin, low temperatures may cause crystallization and precipitation, but the albendazole particles themselves are not affected by low temperatures.
Light Exposure
Direct light exposure causes albendazole degradation and disrupts the suspension agent structure, forming hard precipitates that are difficult to disperse after shaking. Such precipitates are typically accompanied by darkening of color (from white to pale yellow) and the development of an off-odor.
Seal failure
If the bottle cap is not tightly sealed, moisture from the air may enter the bottle, potentially altering the formulation's pH and promoting particle aggregation. Additionally, moisture evaporation may cause concentration increases exceeding the suspending agent's carrying capacity, leading to precipitation.
Impact of precipitation on efficacy and safety
Inaccurate dosage
The precipitation causes uneven distribution of particles during administration, resulting in actual intake doses that may be lower or higher than the labeled amount, thereby affecting the deworming effect. For example, the deworming rate for pig roundworms requires an arbenazide concentration to reach the effective threshold; insufficient dosage may lead to deworming failure.
Local irritation risk
Hard precipitation in the gastrointestinal tract may form lumps, delaying drug release and increasing irritation to the gastric mucosa. Especially for young animals and pets, it may cause adverse reactions such as vomiting and diarrhea.
Decreased bioavailability
The arbenazide micro-particles in the precipitation aggregate, resulting in a reduced surface area and a slower dissolution rate, thereby reducing absorption. Studies have shown that nano suspensions can significantly improve bioavailability by reducing particle size, while precipitation formation reverses this advantage.
Solutions and preventive measures
Optimized storage conditions
Temperature: Store at 2–8°C in a refrigerator; avoid freezing.
Light: Use brown bottles or light-protected packaging, and store in a cool, dry place.
Sealing: Tighten the cap immediately after each use to prevent moisture and air from entering.
Pre-use Inspection
Observe the appearance of the solution: If significant precipitation, discoloration, or an unusual odor is present, the solution is considered degraded and should not be used.
Shaking Test: After gentle shaking, the precipitation should disperse rapidly. If the precipitation is compact and difficult to disperse, the solution should be discarded.
Formulation improvement directions
Optimization of suspending agents: Use composite suspending agents (e.g., xanthan gum + sodium carboxymethyl cellulose) to enhance stability.
pH adjustment: Add buffering agents (e.g., phosphates) to maintain pH within the range of 5.0–7.0.
Nanotechnology: Prepare albendazole nano-suspension with particle sizes reduced to 200–500 nm to significantly improve physical stability.
Frequently Asked Questions
How to give albendazole oral suspension 10 mL?
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It should be taken with or without meals or as directed by physician. The dosage schedule of albendazole suspension 200 mg/5 mL oral suspension is mentioned follow: Adults and children over two years: 10 ml suspension (400 mg) as a single dose. Children (1-2 years): 5ml suspension (200 mg) as a single dose.
What is albendazole suspension used for?
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Albendazole is used to treat neurocysticercosis, an infection of the nervous system caused by pork tapeworms. This medicine is also used to treat cystic hydatid disease of the liver, lung, and peritoneum, an infection caused by dog tapeworms. Albendazole is used to treat infections caused by worms.
What is albendazole oral suspension 400 mg 10 mL?
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Albendazole Suspension 400mg/10mL is a broad-spectrum anthelmintic (dewormer) used to treat a variety of intestinal worm infestations, including roundworms, hookworms, whipworms, and pinworms.
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