Pepsin A
Pepsin A is a proteolytic digestive enzyme that breaks down proteins into smaller peptides during the digestive process. It is primarily used as a digestive aid for patients with enzyme insufficiency.
Pepsin A is a digestive enzyme used to assist in protein digestion for patients with enzyme deficiencies.
Key facts at a glance
- ATC
- A09AA03
- RxNorm
- 8016
- Generic
- Pepsin A
- Class
- atc-a09
- Brands
- —
- Availability
- rx
- Lactation
- unknown
- Routes
- oral
- Forms
- capsule, tablet
- Regions
- US, EU, CN, JP
- Monitoring
- —
This page is for informational purposes only.
Do not use this information to diagnose yourself or to replace a physician's advice. Always consult a qualified healthcare provider before starting, stopping, or changing any medication. If you believe you are experiencing a medical emergency, call your local emergency number immediately.
Dosage and administration
- Usual dose
- 500mg twice daily
- Maximum
- consult physician
- Frequency
- every 12 hours
- Instructions
- Follow physician instructions
- Duration limits
- as prescribed
- Monitoring
- standard
- Usual dose
- 250mg twice daily
- Maximum
- consult physician
- Frequency
- every 12 hours
- Instructions
- Follow physician instructions
- Duration limits
- as prescribed
- Monitoring
- standard
- Usual dose
- 400mg daily
- Maximum
- consult physician
- Frequency
- once daily
- Instructions
- Follow physician instructions
- Duration limits
- as prescribed
- Monitoring
- standard
Overdose information
Special Populations
7 groupspregnancy
first trimesteruse lowest effective dose
consult healthcare provider before use; benefits should outweigh potential risks
standard prenatal care
Use with caution and monitor for adverse effects.
pregnancy
third trimesteruse lowest effective dose
consult healthcare provider before use
standard prenatal care
Use with caution and monitor for adverse effects.
lactation
breastfeedingno adjustment needed
generally considered safe; consult physician if concerns
none specific
geriatric
elderlyno specific adjustment needed
standard dosing appropriate; consider overall health status
routine monitoring
pediatric_age
children 2 12weight-based dosing recommended
use under medical supervision; appropriate for pediatric use
monitor response and tolerance
Use with caution and monitor for adverse effects.
renal_impairment
mild to moderateno adjustment needed
no significant systemic absorption; standard dosing applies
routine renal function monitoring
hepatic_impairment
mild to moderateno adjustment needed
not metabolized hepatically in significant amounts; standard dosing applies
routine liver function monitoring
Statistics and clinical data
Commonly prescribed since
General prescribing information for digestive enzyme supplements
Drug class
Enzyme classification information
Common uses
Common therapeutic uses for enzyme supplementation
Mechanism of action
Primary mechanism of action description
Pepsin A is used to treat digestive enzyme insufficiency, including conditions such as achlorhydria (low stomach acid), dyspepsia associated with enzyme deficiency, and as supplemental therapy in patients with chronic pancreatitis or other conditions affecting digestive enzyme production.
Pepsin A works by hydrolyzing (breaking down) proteins into smaller peptide fragments in the acidic environment of the stomach. It is secreted as pepsinogen by chief cells and activated by stomach acid to become pepsin, where it preferentially cleaves peptide bonds adjacent to aromatic amino acids.
Pepsin A should be taken with or immediately before meals. It is typically derived from animal sources (porcine). Patients with known allergies to pork products should avoid this medication. Efficacy depends on adequate stomach acidity for activation. Consult a healthcare provider before use if pregnant, breastfeeding, or taking other digestive medications.
Contraindications
Conditions and patient states where this medication should be avoided or used with caution.
Do not use (1)
Known allergy to this medication or its components
Use caution (1)
Consult healthcare provider for benefits vs risks assessment
Official drug label
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This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.
This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.
If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.
Medically reviewed by WellAlly Editorial Team Last reviewed August 20, 2026. · Read our editorial policy