Oral Dissolving Films: How This Innovative Dosage Form Is Changing Medication Delivery

Oral Dissolving Films: How This Innovative Dosage Form Is Changing Medication Delivery

For many people, taking medication means swallowing a tablet or capsule with water. However, conventional oral dosage forms are not always easy to administer.


Children may have difficulty swallowing tablets, while older adults and people with swallowing difficulties may experience discomfort when taking solid medicines. Patients who are bedridden or have certain neurological conditions may also face challenges with conventional oral medications.


These challenges have encouraged pharmaceutical researchers to explore alternative dosage forms that can make drug administration more convenient.


One such technology is the oral dissolving film (ODF). Thin, flexible, and designed to dissolve rapidly in the mouth, oral dissolving films have attracted increasing attention as an alternative to some conventional oral dosage forms.


What Are Oral Dissolving Films?


Oral dissolving films are thin pharmaceutical films containing an active pharmaceutical ingredient (API) and various excipients. They are designed to be placed on the tongue or in the oral cavity, where they rapidly hydrate and disintegrate in saliva.


According to the 2025 edition of the Pharmacopoeia of the People’s Republic of China, film preparations are film-shaped dosage forms made from active pharmaceutical ingredients and suitable film-forming materials for oral or mucosal administration.


Oral dissolving films are designed to dissolve rapidly in the mouth and may produce local or systemic effects.


Depending on the formulation and the drug's properties, the released active ingredient may:


  1. Be absorbed through the oral mucosa;
  2. Be swallowed with saliva and subsequently absorbed through the gastrointestinal tract;
  3. Or follow a combination of these pathways.

This distinction is important because not every oral dissolving film provides significant buccal or sublingual drug absorption. The absorption pathway depends on the drug, formulation, site of administration, and other pharmaceutical characteristics.


Why Are Oral Dissolving Films Gaining Attention?


The development of ODFs is closely related to the need for more convenient drug administration. Several characteristics make this dosage form particularly interesting for pharmaceutical development.


1. Easier Administration for Some Patients


Swallowing conventional tablets or capsules can be difficult for certain patient populations.


These may include:


  1. Children;
  2. Older adults;
  3. People with swallowing difficulties;
  4. Patients with neurological disorders;
  5. Bedridden patients;
  6. People who have difficulty taking conventional solid oral medicines.

An ODF can be placed directly in the mouth and allowed to dissolve without requiring the patient to swallow an intact tablet.


For pediatric medicines, taste is another important consideration. Bitter or unpleasant-tasting drugs can reduce patient acceptance and medication adherence. ODF formulations can incorporate taste-masking approaches and suitable flavoring agents to improve palatability.


However, taste masking and patient acceptance depend on the specific formulation and should be evaluated during product development.


Read: How Do Oral Surgeons Handle Complex Dental Issues?


2. No Water May Be Required


One of the most practical characteristics of ODFs is that they can generally be administered without water.


This can be useful in situations where access to drinking water is inconvenient, such as:


  1. Traveling;
  2. Commuting;
  3. Outdoor activities;
  4. Work environments;
  5. Certain situations involving swallowing difficulties.

The small size and low weight of ODF packaging may also make the dosage form convenient to carry.


3. Potential for Rapid Drug Release


Because the film is designed to dissolve quickly in saliva, ODFs can provide rapid disintegration and drug release in the oral cavity.


For some active ingredients, drug absorption through the oral mucosa may contribute to faster systemic exposure. In certain cases, buccal or sublingual administration can also reduce exposure to gastrointestinal degradation and hepatic first-pass metabolism.


However, these benefits are drug- and formulation-dependent. An ODF should not automatically be considered faster acting or more bioavailable than a tablet or capsule.


The actual pharmacokinetic performance must be demonstrated through appropriate pharmaceutical and clinical studies.


What Is Inside an Oral Dissolving Film?


Although an ODF looks like a simple thin film, its formulation can involve several pharmaceutical technologies.


A typical formulation may contain:


  1. Active pharmaceutical ingredient (API): Provides the intended therapeutic effect.
  2. Film-forming polymers: Create the structural matrix of the film.
  3. Plasticizers: Improve flexibility and reduce brittleness.
  4. Sweeteners and flavoring agents: Help improve taste and patient acceptability.
  5. Taste-masking agents: Reduce the perception of unpleasant drug flavors.
  6. Surfactants: May improve wetting, dispersion, or dissolution characteristics.
  7. Stabilizers: Help maintain product quality during storage.

Common pharmaceutical excipients may include materials such as hydroxypropyl methylcellulose (HPMC), pullulan, polyethylene glycol, mannitol, sucrose, and certain surfactants, depending on the formulation.


The selection and concentration of these ingredients can influence important characteristics such as:


  1. Film thickness;
  2. Mechanical strength;
  3. Flexibility;
  4. Disintegration time;
  5. Dissolution behavior;
  6. Drug uniformity;
  7. Moisture sensitivity;
  8. Stability;
  9. Taste and mouthfeel.

For this reason, developing an ODF is not simply a matter of converting a tablet formulation into a film. The drug and excipient combination must be carefully optimized.


How Are Oral Dissolving Films Manufactured?


Several manufacturing approaches have been investigated for ODF production.


Solvent Casting


Solvent casting is one of the commonly discussed approaches for producing oral films.


In a typical process, the API and selected excipients are dispersed or dissolved in a suitable formulation medium. The mixture is then cast into a thin layer and dried under controlled conditions.


The resulting film is cut into individual doses.


Key manufacturing parameters may include:


  1. Polymer concentration;
  2. Viscosity;
  3. Drying temperature;
  4. Drying time;
  5. Film thickness;
  6. Drug distribution;
  7. Residual moisture.

Hot-Melt Extrusion


Hot-melt extrusion is another manufacturing approach that can be used for selected formulations.


It processes drug and polymer mixtures under controlled temperature and mechanical conditions without relying on large amounts of solvent.


However, not every active pharmaceutical ingredient is suitable for this technology. Thermal stability and compatibility with the polymer system must be evaluated.


Which Medicines Can Be Formulated as Oral Dissolving Films?


ODF technology has been investigated or used for a range of pharmaceutical applications.


Examples include formulations involving:


  1. Antiemetic medicines;
  2. Allergy medications;
  3. Analgesic medicines;
  4. Neurological medicines;
  5. Pediatric medicines;
  6. Selected medicines requiring convenient oral administration.

Examples of ODF products and formulations include ondansetron oral dissolving films and montelukast oral dissolving films.


The suitability of a particular drug for ODF development depends on multiple factors, including:


  1. Dose size;
  2. Solubility;
  3. Stability;
  4. Taste;
  5. Absorption characteristics;
  6. Therapeutic window;
  7. Required release profile;
  8. Compatibility with film-forming materials.

High-dose drugs can present particular challenges because only a limited amount of active ingredient can generally be incorporated into a thin film while maintaining acceptable physical properties.


What Are the Advantages and Limitations of ODFs?


Like other pharmaceutical dosage forms, oral dissolving films have both potential advantages and technical limitations.


Potential Advantages


ODFs may offer:


  1. Convenient administration;
  2. No need to swallow an intact tablet;
  3. Potentially reduced dependence on drinking water;
  4. Small and portable dosage forms;
  5. Rapid film disintegration;
  6. Opportunities for taste masking;
  7. Potential applications in pediatric and geriatric medicines.

Potential Limitations


However, ODF technology also presents several challenges.


These include:


  1. Limited drug-loading capacity;
  2. Moisture sensitivity;
  3. Film mechanical strength;
  4. Taste and mouthfeel;
  5. Content uniformity;
  6. Packaging requirements;
  7. Stability concerns;
  8. Manufacturing scale-up;
  9. Compatibility between APIs and film-forming polymers.

These factors must be addressed during formulation development and manufacturing.


Oral Dissolving Films vs. Tablets and Capsules


ODFs are not necessarily designed to replace tablets and capsules in every situation.


Instead, they provide another dosage-form option for selected medicines and patient populations.



Characteristic

Oral Dissolving Films

Tablets

Capsules

Water required

Generally not required

Often preferred

Often preferred

Swallowing intact dosage form

No

Yes

Yes

Portability

High

High

High

Drug-loading capacity

Generally limited

Generally higher

Generally higher

Taste considerations

Important

Usually less prominent

Often less prominent

Film stability

Moisture can be important

Generally robust

Generally robust

Potential mucosal absorption

Possible for suitable drugs

Usually limited

Usually limited


The best dosage form ultimately depends on the characteristics of the drug, formulation requirements, manufacturing process, and needs of the intended patient population.


The Future of Oral Dissolving Film Technology


As pharmaceutical development increasingly focuses on patient-centered drug delivery, alternative dosage forms are receiving greater attention.


ODFs are particularly interesting because they combine pharmaceutical formulation technology with a simple method of administration.


Future development may focus on:


  1. Higher drug-loading capacity;
  2. Improved taste-masking technologies;
  3. Better moisture resistance;
  4. More sophisticated controlled-release films;
  5. Improved manufacturing scalability;
  6. Combination-drug films;
  7. Personalized dosage forms;
  8. Pediatric and geriatric applications.

Advances in polymers, excipients, manufacturing technologies, and drug-delivery systems may further expand the range of active ingredients that can be incorporated into oral films.


Conclusion


Oral dissolving films represent an important development in modern pharmaceutical dosage-form technology.


Their ability to rapidly disintegrate in the mouth, reduce the need to swallow an intact solid dosage form, and potentially support different drug-absorption pathways makes them an attractive option for selected medicines.


At the same time, ODFs are not universally superior to conventional tablets or capsules. Drug loading, stability, taste, manufacturing requirements, and pharmacokinetic performance all need to be carefully evaluated.


As pharmaceutical research continues to focus on convenient and patient-centered drug delivery, oral dissolving films may become an increasingly important platform for the development of next-generation oral medicines.