Diphenoxylate HCl is an antidiarrheal agent that slows intestinal motility by acting on the smooth muscles of the gastrointestinal tract, thereby reducing the frequency and urgency of diarrhea. It is a synthetic opioid that, at therapeutic doses, does not produce central nervous system effects typical of opioids but effectively decreases bowel movements.
Atropine Sulfate is an anticholinergic agent that helps prevent misuse of diphenoxylate by causing mild side effects such as dry mouth, blurred vision, and dizziness if taken in higher-than-recommended doses. The inclusion of atropine acts as a deterrent to overdose and abuse.
Combined Formulation:
This combination is formulated to provide effective relief from diarrhea while minimizing the risk of misuse. It is generally supplied in tablet or liquid form, with precise dosing to ensure safety and efficacy.
Uses:
Management of acute and chronic diarrhea
Reduction of stool frequency and liquidity
Mechanism of Action:
Diphenoxylate reduces intestinal motility and slows transit time.
Atropine reduces secretions and counters the potential for abuse.
Diphenoxylate HCl: Confirmed by chemical tests such as IR spectroscopy and related substance tests.
Atropine Sulfate: Confirmed by chemical tests, including specific IR or UV absorption.
2. Assay
Diphenoxylate HCl: The combined active ingredients should be within the specified range, generally 97.0% to 102.0% of the labeled amount, determined by a validated assay method such as HPLC.
Atropine Sulfate: Should be within the specified range, typically 97.0% to 102.0% of labeled amount.
3. Impurities
Related Substances: Limits for unspecified and specified impurities are set, usually not exceeding 0.2% for each impurity and 0.5% for total impurities.
Residual Solvents: Must meet ICH guidelines and be within permissible limits.
4. Loss on Drying
Typically not more than 0.5% to 1.0%, indicating residual moisture content.
5. Residue on Ignition
Not more than 0.1% to 0.2%, accounting for inorganic residues.
6. Physical Characteristics
Appearance: Usually a white or off-white crystalline powder or tablets.
pH of Solution: For solutions, within an acceptable pH range (e.g., 4.5 to 5.5).
7. Microbial Limits
Meets specified microbial limits, including absence of pathogenic bacteria like Salmonella and Escherichia coli.
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