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Specifications
| Grade | CP2020 |
| Appearance | White or almost white crystalline powder, odorless. Soluble in water, dissolved in methanol or ethanol, almost insoluble in propanol or chloroform. |
| Assay (Dry Product) | C₂₁H₂₅ClN₂O₃·2HCl: 99.0% min |
| Absorption Coefficient | At 231nm wavelength: 365 to 385 |
| Identification | |
| Thin Layer Chromatography | Color and position of main spots should match the control solution |
| UV | Maximum absorption at 231nm and minimum at 218nm |
| IR | Infrared spectrum corresponding to reference spectrum (Spectrum Set 826) |
| Chemical Reaction | Should be positive |
| Inspect | |
| pH | 1.2 to 1.8 |
| Clarity and color of Solution | Clear colorless, not deeper than Yellow-green No. 1 Standard colorimetric solution |
| Cyanide | Should conform to regulations |
| Related Substances | Single impurity ≤0.5% of main peak; total impurities ≤1.0% of main peak |
| Residual Solvent (according to external standard method) | |
| Methanol | 0.3% max |
| Ethanol | 0.5% max |
| Aceton | 0.5% max |
| Dichloromethane | 0.06% max |
| Benzene | 0.0002% max |
| Toluene | 0.089% max |
| N,N-dimethylformamide | 0.088% max |
| Loss on Drying | 0.5% max |
| Residue on Ignition | 0.1% max |
| Heavy Metals | 10 ppm max |
| Microbial Limit | |
| Total aerobic bacteria | 10³ cfu/g max |
| Mold and yeast count | 10² cfu/g max |
| Escherichia coli | Should not be detected |
Applications
Cetirizine hydrochloride is a second-generation antihistamine widely used in the pharmaceutical industry for the management of allergic conditions. Its primary applications include the treatment of allergic rhinitis, chronic urticaria, and other hypersensitivity reactions caused by histamine release. Unlike first-generation antihistamines, cetirizine hydrochloride has minimal sedative effects, making it suitable for long-term use in both adults and children. It is formulated in various dosage forms such as tablets, syrups, and orally disintegrating tablets, and is often included in combination therapies for multi-symptom allergy relief. Additionally, cetirizine hydrochloride serves as a reference standard in pharmacological research and quality control laboratories, where it is used to test antihistaminic activity, optimize formulations, and validate analytical methods in the production of allergy medications.
Benefits
The benefits of cetirizine hydrochloride stem from its efficacy, safety profile, and convenience of use. It effectively alleviates allergy symptoms such as sneezing, runny nose, itching, and watery eyes by selectively blocking peripheral H1 histamine receptors without causing significant central nervous system depression. Its long duration of action allows for once-daily dosing, improving patient compliance. The compound's rapid onset of action provides timely relief from acute allergic episodes, while its low sedative potential makes it safe for daytime use and in individuals who require alertness. Moreover, cetirizine hydrochloride has been shown to have a favorable interaction profile with other medications, reducing the risk of adverse effects. Its consistent therapeutic efficacy across diverse populations underscores its value as a frontline antihistamine in clinical practice.
Conclusion
Cetirizine hydrochloride is a widely recognized antihistamine with extensive applications in treating allergic disorders. Its ability to provide rapid, effective, and sustained relief with minimal sedation makes it a preferred choice in both clinical and over-the-counter allergy management. By combining strong therapeutic efficacy with a favorable safety profile, cetirizine hydrochloride enhances patient quality of life, supports adherence to treatment regimens, and serves as a reliable compound in pharmaceutical research and formulation development. Its role in modern allergy therapy highlights its significance as an essential pharmaceutical ingredient.
