Film and Strip

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FILM AND STRIP FOR DRUG DELIVERY Presented by: Harshad Parmar

description

Film and strip as Novel Drug Delivery System

Transcript of Film and Strip

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FILM AND STRIP FOR DRUG DELIVERY

Presented by: Harshad Parmar

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The film drug delivery uses a dissolving film or oral drug strip to administer drugs via absorption in the mouth (buccally or sublingually) and/or via the small intestines (enterically).

The film drug delivery has emerged as an advanced alternative to the traditional tablets, capsules and liquids often associated with prescription and OTC medications.

Similar in size, shape and thickness to a postage stamp, film and strips are typically designed for oral administration, with the user placing the strip on or under the tongue or along the inside of the cheek.

Introduction

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A film is prepared using hydrophilic polymers that rapidly dissolves on the tongue or buccal cavity, delivering the drug to the systemic circulation via dissolution when contact with liquid is made.

As the strip dissolves, the drug can enter the bloodstream enterically, buccally  or sublingually.

Evaluating the systemic transmucosal drug delivery, the buccal mucosa is the preferred region as compared to the sublingual mucosa.

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History

Undergraduate biomedical engineering students at Johns Hopkins University , have created a new drug delivery system based on the thin film technology used by a breath freshener.

Laced with a vaccine against rotavirus, the strips could be used to provide the vaccine to infants in impoverished areas.

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The first commercial non-drug product to use thin films was the Listerine PocketPaks,breath freshening strips.

Since then, thin film products for other breath fresheners, as well as a number of cold, cough, flu and anti-snoring medications, have entered the marketplace.

There are currently several projects in development that will deliver prescription drugs utilizing the thin film dosage form.

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Advantages

The sublingual and buccal delivery of a drug via film has the potential to improve the onset of action, lower the dosing, and enhance the efficacy and safety profile of the medicament

All tablet dosage forms, softgels and liquid formulations primarily enter the blood stream via the gastrointestinal tract, which subjects the drug to degradation from stomach acid, bile, digestive enzymes and other first pass effects. As a result, such formulations often require higher doses and generally have a delayed onset of action.

Thin film is more stable, durable and quicker dissolving than other conventional dosage forms

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The film enables improved dosing accuracy relative to liquid formulations since every strip is manufactured to contain a precise amount of the drug.

The film not only ensures more accurate administration of drugs but also can improve compliance. These properties are especially beneficial for pediatric, geriatric and neurodegenerative disease patients where proper and complete dosing can be difficult.

The film’s ability to dissolve rapidly without the need for water provides an alternative to patients with swallowing disorders and to patients suffering from nausea, such as those patients receiving chemotherapy.

The film drug delivery has the potential to allow the development of sensitive drug targets that may otherwise not be possible in tablet or liquid formulations.

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Formulation of oral drug strips involves the application of both aesthetic and performance characteristics such as

strip-forming polymers, plasticizers, active pharmaceutical ingredient, sweetening agents, Saliva stimulating agent, flavoring agents, coloring agents, stabilizing and thickening agents. From the regulatory perspectives, all excipients  used in the

formulation of oral drug strips should be approved for use in oral pharmaceutical dosage forms.

Oral drug strip development

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Strip forming polymers

The polymer employed should be non-toxic, non-irritant and devoid of leachable impurities. It should have good wetting and spreadability property.

The polymer should exhibit sufficient peel, shear and tensile strengths. The polymer should be readily available and should not be very expensive.

Film obtained should be tough enough so that there won't be any damage while handling or during transportation.

Combination of microcrystaline cellulose and maltodextrin has been used to formulate

Oral Strips of piroxicam made by hot melt extrusion technique.

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Plasticizer

Plasticizer is a vital ingredient of the Oral Strip formulation. It helps to improve the flexibility of the strip and reduces the brittleness of the strip.

Plasticizer significantly improves the strip properties by reducing the glass transition temperature of the polymer. 

Glycerol, Propylene glycol, low molecular weight polyethylene glycols, phthalate  derivatives like dimethyl, diethyl and dibutyl phthalate   Citrate derivatives such as tributyl, triethyl, acetyl citrate, triacetin and castor oil are some of the commonly used plasticizer excipients.

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Active pharmaceutical ingredient

Since the size of the dosage form has limitation, high dose molecules are difficult to be incorporated in Organic Solvent.

Generally 5%w/w to 30%w/w of active pharmaceutical ingredients can be incorporated in the Organic Solvent.

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Sweeting, flavoring and coloring agents

An important aspect of thin film drug technology is its taste and color.

The sweet taste in formulation is more important in case of pediatric population.

Natural sweeteners as well as artificial sweeteners are used to improve the flavor of the mouth dissolving formulations for the flavors changes from individual to individual. Pigments such as titanium dioxide is incorporated for coloring.

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Stabilizing and thickening agentsThe stabilizing and thickening agents are employed to

improve the viscosity and consistency of dispersion or solution of the strip preparation solution or suspension before casting.

Drug content uniformity is a requirement for all dosage forms, particularly those containing low dose highly potent drugs.

To uniquely meet this requirement, thin film formulations contain uniform dispersions of drug throughout the whole manufacturing process.

 Since this criteria is essential for the quality of the thin film and final pharmaceutical dosage form, the use of Laser Scanning Confocal Microscopy (LSCM) was recommended to follow the manufacturing process.

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Film designed for Bidirectional drug release

Matrix type( Bi-directional): The buccal film designed in a matrix configuration contains drug, adhesive, and additives mixed together.Bi-directional (Figure 1) films release drug in both the mucosa and the mouth

TYPES OF FILMS

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2. Reserviour type(Unidirectional): The buccal film designed in a reservoir system contains a cavity for the drug and additives separate from the adhesive. An impermeable backing is applied to control the direction of drug delivery; to reduce film deformation and disintegration while in the mouth; and to prevent drug loss.

Buccal film designed for Uni directional drug release

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METHOD OF PREPARATION

1 Solvent castingIn this, all film excipients including the

drug co-dispersed in an organic solvent and coated onto a sheet of release liner.

After solvent evaporation, a thin layer of the protective backing material is laminated onto the sheet of coated release liner to form a laminate that is die-cut to form patches of the desired size and geometry.

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Direct milling In this, fims are manufactured without the use of

solvents (solvent-free). Drug and excipients are mechanically mixed by direct milling or by kneading, usually without the presence of any liquids. After the mixing process, the resultant material is rolled on a release liner until the desired thickness is achieved. The backing material is then laminated as previously described.

While there are only minor or even no differences in film performance between flms fabricated with the two processes, the solvent-free process is preferred because there is no possibility of residual solvents and no associated solvent-related health issues.

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Evaluation

Physical evaluationIt includes- Weight uniformity, Content

uniformity, Thickness- uniformity.Mass uniformity tested in different randomly

selected patches from each batch and patch thickness measured at 5 different randomly selected spots using a screw gauge.

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Swelling index:

Buccal films were weighed individually (W1) and placed separately in 2% agar gel plates with the core facing the gel surface and incubated at 37-C ±1-C. At regular 1- hour time intervals until 6 hours, the tablet was removed from the Petri dish, and excess surface water was removed carefully with filter paper. The swollen was then reweighed (W2) and the swelling index (SI) was calculated using the formula given in equation.

Swelling Index = (W2-W1) X 100 W1

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The United States Pharmacopeia (USP) XXIII rotating paddle method used to study the drug release film or strip. The dissolution medium consisted of phosphate buffer pH 6.8.

The release was performed at 370C ± 0.50C, with a rotation speed of 50 rpm. The backing layer of buccal film attached to the glass disk with instant adhesive (cyanoacrylate adhesive).

The disk was allocated to the bottom of the dissolution vessel. Samples (5 mL) were withdrawn at predetermined time intervals and replaced with fresh medium.

The samples filtered through Whatman filter paper and analyzed after appropriate dilution by UV spectrophotometry at suitable nm.

In vitro drug release

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Measurement of Mechanical Properties

Mechanical properties of the films (patches) includes tensile strength and elongation at break evaluated using a microprocessor based advanced force gauze equipped with a motorized test stand equipped with a 25 kg load cell OR The istronâ tensile tester.

Film or strip with the dimensions 60 x 10 mm and without any visual defects cut and positioned between two clams separated by a distance of 3 cm.

Clamps designed to secure the film without crushing it during the test, the lower clamp held stationary and the strips were pulled apart by the upper clamp moving at a rate of 2 mm/sec until the strip broke.

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The force and elongation of the film at the point when the strip break are recorded. The tensile strength and elongation at break values are calculated using the formula.

Tensile strength = Force at break (kg)

(kg/mm-2) Initial cross sectional area of sample(mm2)

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Folding Endurance

The folding endurance of films was determined by repeatedly folding 1 film at the same place till it breaks.

Repeat the experiment thrice and note down average value.

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Films subjected to accelerated stability testing. Films packed in glass Petri dishes lined with aluminum foil and kept in an incubator maintained at 37±0.5 0C and 75±5% RH for 6 months.

Changes in the appearance, residence time, release behavior and drug content of the stored bioadhesive films investigated after 1, 2, 3, 4, 5, and 6 months.

The data presented the mean of three determinations. Fresh and aged medicated patches, after 6 months storage, investigated using scanning electron microscope.

Ageing

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Commercial Oral strip drugs

There are not yet many medications available in a thin film form on the market. Those that are include:

BenadrylGas-XMelatonin PMOrajel KidsSudafedSuppressTheraFluTriaminic

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An application to the Food and Drug Administration (United States) for a thin-film formulation of ondansetron has been accepted for review .

On 9 July 2010 MonoSol Rx(in collaboration with APR Applied Pharma Research s.a.and Labtec GmbH) announced that its partner, Strativa Pharmaceuticals, the proprietary products division of ParPharmaceutical, received approval from the US FDA for Zuplenz® (ondansetron) oral soluble film (OSF) for the prevention of postoperative, highly and moderately emetogenic cancer chemotherapy-induced, and radiotherapy-induced nausea and vomiting

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References"Oral Thin Films," in Orally Disintegrating Tablet and

Film Technologies, 5th ed. (Technology Catalysts International, Falls Church, VA, 2008).

"Drug Delivery Via Dissolving Strips.". Drug Discovery & Development 10 (7): 10. 2007.ISSN 1524783X.

Dixit, R., & Puthli, S."Oral strip technology: Overview and future potential.". Journal of Controlled Release (Mumbai,India) (2): 94–107.

"FDA Office of Regulatory Affairs, Sec. 460.600 Content Uniformity Testing of Tablets and Capsules". Fda.gov. Retrieved 2009-09-21.

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