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What Is a Nanoemulsion?

A nanoemulsion is a dispersion of very small droplets of one liquid within another liquid that does not normally mix with it. Pharmaceutical nanoemulsions are commonly oil-in-water or water-in-oil systems stabilized by surfactants and sometimes other excipients. Their droplets are generally within the nanoscale, although exact size definitions vary across scientific and regulatory contexts. Nanoemulsions can carry active ingredients and change their solubility, absorption, distribution, or release.

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What Is a Nanoemulsion?

A nanoemulsion is a dispersion of very small droplets of one liquid within another liquid that does not normally mix with it. Pharmaceutical nanoemulsions are commonly oil-in-water or water-in-oil systems stabilized by surfactants and sometimes other excipients. Their droplets are generally within the nanoscale, although exact size definitions vary across scientific and regulatory contexts. Nanoemulsions can carry active ingredients and change their solubility, absorption, distribution, or release.

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What Are Nanoemulsions Used For?

Nanoemulsions are studied and used to deliver drugs that dissolve poorly in water. They can be designed for oral, topical, ocular, nasal, intravenous, or other product-specific routes. Potential applications include medicines, vaccines, diagnostic agents, and cosmetic or dermatologic products. The formulation must be evaluated for the intended route because ingredients acceptable on the skin are not automatically suitable for injection or ingestion.

How Do Nanoemulsions Deliver Drugs?

A drug can be dissolved in the dispersed oil phase, the surrounding water phase, or near the droplet interface. Small droplets create a large surface area that can improve dissolution and contact with biological membranes. After administration, the active ingredient can leave the droplets through diffusion, digestion of the lipid phase, dilution, or interaction with tissues and proteins. Droplet composition and size influence release, absorption, and distribution.

How Are Nanoemulsions Prepared?

High-energy methods include high-pressure homogenization, microfluidization, and ultrasonication. Low-energy approaches use changes in composition or temperature to support spontaneous emulsification or phase inversion. Manufacturers control the oil, water, surfactant, cosurfactant, mixing conditions, droplet size, and drug loading. Sterile products require additional controls for microbial quality, particulate contamination, endotoxins, and container compatibility.

What Are the Stability and Safety Considerations?

Nanoemulsions are kinetically stable rather than permanently stable at thermodynamic equilibrium. Droplets can grow, merge, cream, sediment, or change after heat, freezing, dilution, or prolonged storage. Surfactants and other excipients can irritate tissues or cause toxicity at unsuitable concentrations. Each formulation requires testing for droplet size, uniformity, drug release, chemical stability, route-specific safety, and shelf life.

Frequently Asked Questions About Nanoemulsions

Is a nanoemulsion the same as a microemulsion?

No. Nanoemulsions are generally kinetically stable systems, while microemulsions are thermodynamically stable under suitable conditions. Their formation, composition, and physical behavior differ.

Is a nanoemulsion the same as a liposome?

No. A nanoemulsion contains liquid droplets stabilized at an interface, while a liposome has one or more lipid bilayers surrounding an aqueous compartment.

Why are nanoemulsions used for poorly soluble drugs?

The oil phase can dissolve a lipophilic drug, while the small droplets disperse it through a water-based product. This can improve apparent solubility and sometimes absorption.

Can a nanoemulsion separate during storage?

Yes. Droplet growth, coalescence, creaming, sedimentation, or temperature-related changes can reduce stability. Storage instructions and expiration limits are formulation specific.

References

Techniques for Formulation of Nanoemulsion Drug Delivery System: A Review. Journal of Nanobiotechnology (PubMed Central). https://pmc.ncbi.nlm.nih.gov/articles/PMC6779084/. Date Accessed August 6, 2026.

Nanoemulsion: An Advanced Mode of Drug Delivery System. 3 Biotech (PubMed Central). https://pmc.ncbi.nlm.nih.gov/articles/PMC4362737/. Date Accessed August 6, 2026.

Recent Insights Into Nanoemulsions: Their Preparation, Properties and Applications. Frontiers in Sustainable Food Systems (PubMed Central). https://pmc.ncbi.nlm.nih.gov/articles/PMC10149285/. Date Accessed August 6, 2026.

Innovations in Nanoemulsion Technology: Enhancing Drug Delivery for Oral, Parenteral, and Ophthalmic Applications. Pharmaceutics (PubMed Central). https://pmc.ncbi.nlm.nih.gov/articles/PMC11510719/. Date Accessed August 6, 2026.

Advancements in Nanoemulsion-Based Drug Delivery Across Different Administration Routes. Pharmaceutics (PubMed Central). https://pmc.ncbi.nlm.nih.gov/articles/PMC11945362/. Date Accessed August 6, 2026.