List of Excipients in Branded Drug HYDROXYZINE PAMOATE

Company	Tradename	Ingredient	NDC	Excipient	Potential Generic Entry
Greenstone LLC	HYDROXYZINE PAMOATE	hydroxyzine pamoate	59762-5420	D&C RED NO. 33
Greenstone LLC	HYDROXYZINE PAMOATE	hydroxyzine pamoate	59762-5420	D&C YELLOW NO. 10
Greenstone LLC	HYDROXYZINE PAMOATE	hydroxyzine pamoate	59762-5420	FD&C GREEN NO. 3
Greenstone LLC	HYDROXYZINE PAMOATE	hydroxyzine pamoate	59762-5420	FD&C YELLOW NO. 6

Generic Drugs Containing HYDROXYZINE PAMOATE

Company	Ingredient	NDC	Excipient
Amneal Pharmaceuticals of New York LLC	hydroxyzine pamoate	0115-1670	D&C YELLOW NO. 10
Amneal Pharmaceuticals of New York LLC	hydroxyzine pamoate	0115-1670	FD&C BLUE NO. 1
Amneal Pharmaceuticals of New York LLC	hydroxyzine pamoate	0115-1670	FERROSOFERRIC OXIDE
Amneal Pharmaceuticals of New York LLC	hydroxyzine pamoate	0115-1670	GELATIN

What are the Most Frequently-Used Excipients in HYDROXYZINE PAMOATE?

# Of NDCs	Excipient
1	ACID YELLOW 3
3	ALCOHOL
4	ALUMINUM OXIDE
17	AMMONIA

Hydoxyzine Pamoate: Excipient Strategy and Commercial Opportunities

Last updated: February 28, 2026

Hydroxyzine pamoate (brand names such as Vistaril and Atarax) is a first-generation antihistamine with anxiolytic, sedative, and antiemetic properties. It is primarily indicated for allergy relief, anxiety, and preoperative sedation. Commercial success depends on efficient formulation, excipient selection, and market differentiation.

What Are the Key Formulation Components for Hydroxyzine Pamoate?

Hydroxyzine pamoate is formulated as a delayed-release capsule. The formulation requires excipients for stability, bioavailability, and patient acceptability.

Core Components

• Active Pharmaceutical Ingredient (API): Hydroxyzine pamoate
• Capsule Shell: Gelatin (or vegetarian alternatives like hydroxypropyl methylcellulose)
• Filling Excipients:
  • Microcrystalline cellulose
  • Lactose (or alternative fillers for lactose intolerance)
  • Magnesium stearate (lubricant)
• Coatings/Delayed-Release Components:
  • Hydroxypropyl methylcellulose phthalate (HPMCP) or other enteric coatings
  • Polymer layers for delayed release

Functional Roles

• Fillers aid in achieving the desired fill volume
• Lubricants facilitate manufacturing
• Enteric coatings protect the API from gastric acid, enabling intestinal absorption
• Disintegrants promote capsule dissolution

Excipient Strategy for Hydroxyzine Pamoate

Stability and Compatibility

Selecting inert excipients that do not interact with hydroxyzine is critical. Hydroxyzine pamoate has limited stability in moisture and light; thus, excipients like silica or coatings must safeguard against degradation.

Bioavailability Optimization

Bioavailability depends on the release profile. Delayed-release coatings such as HPMCP or methacrylate-based polymers prevent premature dissolution, ensuring drug release occurs in the small intestine.

Patient Tolerability

Using hypoallergenic fillers (e.g., microcrystalline cellulose) reduces allergic reactions. Vegetarian capsules broaden market access, especially in regions with vegetarian populations.

Manufacturing Efficiency

Excipients that enhance flow properties and compressibility improve manufacturing yields. Lubricants like magnesium stearate reduce capsule shell sticking hazards.

Commercial Opportunities

Growing Market for Sedatives and Anxiolytics

The global antihistamine market was valued at USD 2.1 billion in 2020, with a CAGR of 6% predicted through 2028. Hydroxyzine remains a core product within this segment.

Patent and Formulation Innovation

• Extended-release formulations: Opportunity for patents and differentiation.
• Lactose-free and vegetarian capsules: Attracting sensitive populations expands market.
• Combination therapies: Co-formulation with other anxiolytics or antihistamines offers cross-selling.

Geographic Expansion

Emerging markets exhibit growth in allergy and anxiety treatment. Localized formulations with culturally adaptable excipients could increase penetration.

Contract Manufacturing and API Supply

Outsourcing APIs and formulations to high-volume contract manufacturers reduces costs and accelerates scale-up. Focus on excipient compatibility testing can streamline regulatory approval.

Regulatory and Cost Dynamics

• Excipients approved by the FDA and EMA facilitate faster registration.
• Cost-effective excipients (e.g., microcrystalline cellulose) versus premium options influence margins.

Competitive Landscape and Differentiation Points

Competitor	Key Formulation Element	Market Focus	Innovation Opportunities
Pfizer	Standard gelatin capsules	U.S., Europe	Extended-release formulations
Teva	Vegetarian capsules	Global	Lighter, eco-friendly excipients
Mylan	Enteric-coated capsules	Developing markets	Coating technology patents

Differentiation depends on optimizing excipient-exposure profiles, manufacturing costs, and bioavailability.

Conclusions

Commercial success hinges on excipient choices that enhance stability, bioavailability, and patient acceptance. Innovation in coating tech and capsule design enables product differentiation and market expansion. Manufacturers should prioritize excipient compatibility, regulatory compliance, and personalized formulation options to capture increasing demand.

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Key Takeaways

• Excipient choices impact stability, release profile, and patient tolerability.
• Enteric coatings like HPMCP are critical for delayed-release formulations.
• Growing markets for sedatives and anxiolytics create commercial opportunities.
• Vegetarian and hypoallergenic excipients expand global market reach.
• Innovation in extended-release and combination products enhances competitive positioning.

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FAQs

1. What excipients are critical for the stability of hydroxyzine pamoate?
Moisture and light-sensitive, hydroxyzine pamoate benefits from excipients like silica and enteric coatings that protect against degradation.

2. How does excipient selection influence bioavailability?
Enteric coatings delay release until the intestines, optimizing absorption and minimizing gastrointestinal side effects.

3. Are there alternative excipients suitable for vegetarian capsules?
Yes, hydroxypropyl methylcellulose capsules replace gelatin, catering to vegetarian populations.

4. What innovation trends attract investment in hydroxyzine formulations?
Extended-release formulations, allergen-free excipients, and combination therapies are key areas.

5. How does geographic market influence formulation decisions?
Local regulatory approvals, cultural preferences, and supply chain logistics shape excipient choices for specific regions.

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References

[1] Statista. (2021). Global antihistamine market size. https://www.statista.com/
[2] U.S. Food and Drug Administration. (2022). Guidance for Industry – Excipients in Drug Products.
[3] European Medicines Agency. (2021). Guideline on the Quality of Modified Release Formulations.
[4] Pharmaceutical Technology. (2019). Advanced coating technologies for delayed-release formulations.