RJS College of Pharmacy Kokamthan, Koapargaon
Peripheral neuropathy is a common neurological disorder often associated with vitamin B12 deficiency. Conventional oral dosage forms such as tablets and capsules present challenges including swallowing difficulty, poor compliance, and delayed onset of action, particularly in elderly and neuropathic patients. Oral dispersible films (ODFs) have emerged as a promising drug delivery system due to their rapid disintegration, ease of administration, and improved bioavailability. This review focuses on the formulation strategies, polymer selection, evaluation parameters, and therapeutic advantages of vitamin B12 oral dispersible films. Emphasis is placed on enhancing patient compliance and therapeutic efficacy in neuropathy management through innovative film-based drug delivery systems. Peripheral neuropathy is a prevalent neurological disorder often associated with vitamin B12 deficiency, leading to nerve damage and impaired neurological function. Conventional oral dosage forms of vitamin B12, such as tablets and capsules, are associated with limitations including swallowing difficulty, delayed onset of action, and poor patient compliance, particularly among geriatric and neuropathic patients. Oral dispersible films (ODFs) have emerged as a novel and patient-friendly drug delivery system that rapidly disintegrates in the oral cavity without the need for water, ensuring ease of administration and improved adherence. This review highlights the formulation strategies and evaluation parameters involved in the development of vitamin B12 oral dispersible films using various film-forming polymers. Key aspects discussed include polymer selection, plasticizers, manufacturing techniques, and physicochemical and performance evaluation of the films. The potential of oral dispersible films to enhance bioavailability, provide rapid therapeutic action, and improve patient compliance in the management of neuropathy is emphasized. The review concludes that vitamin B12 oral dispersible films represent a promising alternative to conventional dosage forms for effective neuropathy treatment.
Neuropathy is characterized by nerve damage resulting in symptoms such as numbness, tingling, pain, and muscle weakness. Vitamin B12 (cobalamin) plays a crucial role in nerve regeneration, myelin synthesis, and neurological function. Deficiency of vitamin B12 is a well-recognized cause of peripheral neuropathy. Traditional dosage forms of vitamin B12, including tablets and injections, have limitations such as poor patient adherence, swallowing difficulties, and invasiveness. Oral dispersible films offer a novel approach that overcomes these drawbacks, making them particularly beneficial for geriatric, paediatric, and neurologically impaired patients.
Role of Vitamin B12 in Neuropathy
Vitamin B12 is essential for: -
Deficiency leads to demyelination and axonal degeneration, contributing to neuropathic symptoms. Supplementation of vitamin B12 is a cornerstone in the management of neuropathy, especially in diabetic, alcoholic, and elderly patients.
Oral Dispersible Films: An Overview
Oral dispersible films are thin, flexible polymeric strips that rapidly disintegrate when placed on the tongue, releasing the drug without the need for water.
Advantages of ODFs
Polymers Used in Vitamin B12 Oral Dispersible Films
Polymers play a vital role in film formation, drug release, and mechanical strength.
Commonly Used Polymers
Plasticizers
Plasticizers such as glycerin, polyethylene glycol (PEG), and propylene glycol are added to improve flexibility and prevent brittleness.
Formulation of Vitamin B12 Oral Dispersible Films
The most commonly used method is the solvent casting technique, which involves:
Other excipients include sweeteners, flavoring agents, saliva-stimulating agents, and coloring agents to improve palatability and patient acceptance.
Evaluation Parameters of Oral Dispersible Films
ODFs are evaluated for both physical and functional properties:
Physicochemical Evaluation
Mechanical Properties
Performance Evaluation
These parameters ensure consistency, stability, and efficacy of the formulation.
Stability Studies
Stability studies are conducted as per ICH guidelines to assess the effect of temperature and humidity on drug content, mechanical strength, and disintegration time over a specified period.
Patient Compliance and Therapeutic Benefits
Vitamin B12 oral dispersible films significantly enhance patient compliance by:
This delivery system is especially advantageous for elderly patients and those with neurological impairments.
Common Types of Neuropathy
An estimated 20 million people in the United States have some form of neuropathy. As we mentioned, there are five main categories to consider. Common types of neuropathy are broken down for you below:
Peripheral Neuropathy
Peripheral Neuropathy is the most common form of neuropathy in patients. This condition results from damage to the peripheral nervous system — the massive communications network that manages information between the central nervous system (the brain and spinal cord) to every other part of your body. This particular nerve damage affects areas such as your toes, feet, legs, fingers, hands and arms. Many patients find that complementary and alternative therapies are effective in managing pain caused by peripheral neuropathy.
Proximal Neuropathy
Proximal Neuropathy is the second most common form of neuropathy. This form of neuropathy encompasses nerve damage in your thighs, hips or gluteal areas of your body. The condition usually affects one side of the body, but can spread to the other side as well.
Cranial Neuropathy
Cranial Neuropathy is a condition describing nerve damage to any of the 12 cranial nerves. The cranial nerves are those that travel from your brain or brainstem. These nerves affect areas like the face and eyes. Johns Hopkins’ medical library breaks down the the different types of cranial neuropathies as:
Autonomic Neuropathy occurs when nerves of your involuntary nervous system (the heart, circulation, digestion, sweat glands, bowel and/or bladder, and sexual organs) are damaged. While diabetes is the most common cause of autonomic neuropathy, other health conditions or infections can also trigger autonomic neuropathy symptoms. Some medications have been shown to cause this particular kind of nerve damage as well.
One of the less common forms of neuropathy, Focal Neuropathy, sometimes referred to as mononeuropathy, affects a single nerve–commonly, those of the wrist, thigh, or foot, although it can sometimes affect the nerves of the back and chest, as well as those that control the eye muscles. Diabetes is often the root cause of this form of neuropathy.
Common Causes of Neuropathy
When it comes to identifying the cause of your neuropathy symptoms, a thorough evaluation is essential. Neuropathy may be caused by:
To diagnose your particular symptoms, and to get to the root of your problem, involve a specialist at Spine Correction Center of the Rockies. Not only can a specialist uncover the cause of your symptoms, but they can also prescribe targeted treatment options to restore function and eliminate pain.
ODFs in Neuropathy
Neuropathy is characterized by nerve damage that often causes pain, numbness, and tingling. Vitamin B12 is essential for producing the myelin sheath (the protective coating of nerves).
Enhanced Compliance: Neuropathy patients, especially the elderly or those with diabetic complications, may suffer from dysphagia (difficulty swallowing). ODFs dissolve in seconds on the tongue without water.
Bypassing First-Pass Metabolism: Absorption through the oral mucosa (sublingual or buccal) can lead to higher bioavailability by entering the systemic circulation directly, bypassing the digestive tract where B12 absorption is often inefficient.
Non-Invasive: ODFs provide a painless alternative to intramuscular B12 injections. effectiveness of an ODF depends on the selection of polymers and excipients.
|
Component |
Example Ingredients |
Role in Formulation |
|
Active Ingredient |
Methylcobalamin |
Active form of B12; neuroprotective agent. |
|
Film-Forming Polymers |
HPMC (E3, E5, E15), PVA, Pullulan, Maltodextrin |
Provides structure, mechanical strength, and flexibility. |
|
Plasticizers |
PEG 400, Glycerol, Propylene Glycol |
Reduces brittleness and improves film flexibility. |
|
Super-disintegrants |
Sodium Starch Glycolate, Crospovidone |
Ensures the film dissolves rapidly (usually <60 seconds). |
|
Sweeteners/Flavors |
Aspartame, Sucralose, Menthol |
Masks the metallic taste of B12 and improves mouthfeel. |
A. Physical & Mechanical Tests
B. Chemical & Dissolution Tests
Clinical Impact on Neuropathy
Methyl cobalamin in ODF form acts as a "painkiller" and "nerve regenerator":
Vitamin B12 deficiency, sometimes called cobalamin deficiency, happens when your body is either not getting enough or not absorbing enough vitamin B12 from the foods you eat. Vitamin B12 is an important nutrient that helps your body make red blood cells and DNA, the genetic material in all of your cells. It’s essential to how your body functions. Without treatment, vitamin B12 deficiency can cause physical, neurological and psychological problems. Vitamin B12 is an important nutrient that helps your body keep your nerve cells and red blood cells healthy. It also helps your body make DNA. Your body doesn’t make vitamin B12 on its own. You have to consume food and drinks that have vitamin B12 to get it. Vitamin B12 is found mostly in animal products, like fish, meat, dairy and eggs. It’s also in fortified foods (foods with vitamins and minerals added to them), like cereals, breads, plant-based milks and nutritional yeast. Adults need around 2.4 micrograms (mcg) of vitamin B12 a day. And women who are pregnant or breastfeeding need more. The amount of B12 babies and children need varies based on age. Two things need to happen for your body to absorb vitamin B12 from the food you eat:
Your digestive system can then absorb B12.
Vitamin B12 deficiency anemia happens when your body doesn’t have enough healthy red blood cells. As B12 helps make red blood cells, a lack of vitamin B12 can cause anemia. But you can also have a vitamin B12 deficiency without having anemia. The symptoms of vitamin B12 deficiency can develop slowly and can get worse over time. You may have no symptoms despite having a low level of vitamin B12 in your body. Vitamin B12 deficiency can cause physical, neurological and psychological symptoms.
Physical symptoms can include:
Neurological symptoms can include:
Psychological symptoms can include:
Vitamin B12 deficiency happens if you aren’t eating enough vitamin B12 or your body isn’t absorbing the vitamin B12 you consume. Situations or conditions that can cause vitamin B12 deficiency include:
Risk factors
You are more likely to develop vitamin B12 deficiency if you have one or more of the following risk factors:
Complications of B12 deficiency
Left untreated, vitamin B12 deficiency can cause lasting side effects that affect your nervous system and brain. More severe side effects include:
Diagnosis a Test
It can be difficult to diagnose vitamin B12 deficiency because you may not have symptoms, or symptoms can be like other nutritional deficiencies. Healthcare providers will usually do blood tests to check for B12 deficiency in people who have a high risk of developing it.
Specific tests to help diagnose vitamin B12 deficiency are:
Treatment
CONCLUSION-
Vitamin B12 oral dispersible films formulated using suitable polymers provide an effective, patient-friendly alternative to conventional dosage forms. Their rapid disintegration, ease of administration, and enhanced compliance make them a promising approach for the management of neuropathy. Continued research and development may further optimize this delivery system for broader therapeutic applications. In conclusion, the development of Vitamin B12 (Methylcobalamin) Oral Dispersible Films (ODFs) represents a significant advancement in the pharmaceutical management of neuropathy. By utilizing biocompatible polymers like HPMC and PVA, this dosage form successfully addresses the primary challenges associated with traditional B12 therapy—namely, poor oral absorption in the GI tract and the needle-phobia associated with frequent injections.
REFERENCE
Vaishnavi Salunke*, Amrita Singh, Formulation and Evaluation of a Vitamin B12 Oral Dispersible Film Using Polymers for Enhanced Patient Compliance in Neuropathy– A Review, Int. J. Sci. R. Tech., 2026, 3 (1), 117-125. https://doi.org/10.5281/zenodo.18170845
10.5281/zenodo.18170845
