FULL PRESCRIBING INFORMATION: CONTENTS*

These excipient mixes including super disintegrants, effervescent agents, and

• These tablets provide a discreet alternative to traditional pills.
• They are designed to dissolve quickly in the mouth or be swallowed.
• Suitable for people who have difficulty swallowing capsules.

sugar-based components offer compressibility, enhanced flow, and disintegrating properties.

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These fast-dissolving oral drug delivery systems were first devised in the late 1970s and became prominent as oral mucosal dosage formulations. Currently, they are available in various forms, including adhesive tablets, gels, ointments, patches, and mouth-dissolving films for buccal delivery [Citation4]. These buccal drug delivery systems over time became a suitable alternative drug form for tablets or capsules. In addition, the oral cavity serves as an ideal route of administration due to its highly vascularized thin membranous structure. Apparently, the lower enzymatic activity in the oral mucosa provides greater permeability and rapid absorption of several drugs, especially drugs with low aqueous solubility.

12.1 Sildenafil Oral Film Mechanism of Action

It also bypasses first-pass metabolism, potentiates higher systemic bioavailability of active pharmaceutical ingredients (APIs), and ensures a rapid onset of action [Citation5]. Oral disintegrating tablets (ODTs) are a kind of oral solid dosage form intended to disintegrate swiftly within seconds of placement on the tongue without necessitating water or chewing [Citation5,Citation6]. Orodispersible films (ODFs) are a drug delivery system that encompasses thin, flexible sheets manufactured with or without plasticizers that usually disperse or disintegrate promptly, usually within seconds, once placed in the mouth. They are designed to be positioned in the buccal cavity either above the tongue or between the gums and cheeks and get directly absorbed into the blood stream. They can be used to deliver different categories of medications, including prescription and non-prescription, or over-the-counter drugs [Citation5].

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The use of ODFs is well-known to resolve issues related to conventional oral dosage forms that include but are not limited to (i) accelerating the time of drug release, (ii) prolonged duration of drug action, (iii) reduced number of dose administrations, and (iv) maximized efficacy of APIs [Citation7]. Besides, this innovative drug delivery system or film technology offers an array of benefits during the pharmacokinetics and pharmacodynamic aspects of the drugs, including (i) improved absorption and metabolism, (ii) site-specific action, (iii) lowering of side effects, and (iv) most significantly enhancing the drug’s bioavailability. ODFs also confer expeditious dissolution, pertinent drug loading capacities, and improved stability and durability of drug formulations. Moreover, they sildenafil 100 mg cost are safe, secure, nontoxic, bioresorbable, and biodegradable. Furthermore, as ODTs evolved, the ODFs achieved patient compliance by circumventing discomfort due to their user-friendly advantages. This technology allows fabrication of tablets at high doses using conventional equipment, making it

a more simple, accessible, and cost-effective method compared to other techniques like wet granulation.

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Thus, the ODFs provide immediate release and disintegration; rapid onset of action; and disease- and target-specific drug action that results in instant and effective reduction of symptoms, relieves discomfort, and restores normal physiological function. These advantages have compelled patients to adhere to their therapy and complete the duration of treatment, resulting in improved quality of life () [Citation8,Citation11–13]. Although there are several names employed to refer oral film dosage forms like thin strips, oral thin films, quick dissolve films, oral films, melt-away films, orally dissolving films, and wafers, they are officially named as ODF by the European Medicines Agency (EMA) or as soluble films by the United States Food and Drug Administration (U.S. FDA) [Citation9]. ), ODFs are delineated as sheets, either single or multilayered, made up of appropriate materials and are designed for rapid dispersion once placed in the mouth.

5.1. Bioequivalence and stability testing

In fact, they instantaneously disintegrate/disperse in saliva, resulting in the formation of solution or suspension, which facilitates rapid absorption and distribution of the drug into the blood circulation [Citation5]. This review discusses the advantages of ODFs in improving compliance and satisfaction in patients with erectile dysfunction (ED) and describes the bioequivalence and stability studies of sildenafil citrate ODF. An online PubMed literature search was conducted to identify English language publications from inception to March 2024 using combinations of the terms erectile dysfunction, ED, phosphodiesterase type 5 inhibitor, phosphodiesterase 5 inhibitor, phosphodieseterase-5 (PDE5) inhibitor, sildenafil, vardenafil, tadalafil, avanafil, drug formulations, drug delivery, buccal mucosa, orally dispersible, orally disintegrating, orodispersible, ODT, ODF, oral dispersible formulations, novel drug delivery, innovative technologies, manufacturing methods, stability studies, stress test, bioequivalence, and regulatory requirements. Other relevant articles were identified by manually reviewing the reference list of selected articles. Orodispersible dosage forms have an ever growing presence in the pharmaceutical market considering that their administration can enhance the bioavailability of most of the drugs and their prescription can ameliorate patient adherence and/or compliance [Citation10].

Supplemental Material

This novel technique has transformed the usual drug delivery methodology for oral drugs. These modified dosage forms, oral films, have replaced oral tablets as they have achieved altered drug release characteristics and faster disintegration. Also, conventional tablets may get easily broken down, necessitating considerable packaging during handling, storage, and transit, while oral films are flexible, handy, and can be kept for long-term use [Citation14]. An ideal and authentic rapid dissolving delivery system is expected to possess the following properties: (i) optimal stability and transportability, (ii) uncomplicated handling and administration, (iii) no distinctive packaging material or processing requirements, (iv) no requirement of water for application, and (v) acceptable palatability. In addition, the film should be thin and elegant in appearance, available in various sizes and shapes, unobstructive, adhere to the oral cavity easily, disintegrate fast without requiring water, and release the drug rapidly. Care must be taken while choosing the type of disintegrant and effervescent and pressure applied during compression as soft pills may exhibit poor mechanical strength and stability and

large, hard tablets may take longer time to disintegrate [Citation23,Citation25].

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The freeze-dried formulations exhibit ideal pharmacological properties including low dosage, microscopic particle size, chemical stability, and easy handling and transport. However, the fabrication process is expensive and time-consuming [Citation22–24]. Compressed tablet-based systems harness the conventional tableting technology by direct compression of the mixture of API and excipients. This technique deliberates to achieve substantial disintegration and packaging requirements [Citation4,Citation8,Citation17]. It allows tablets to be crushed straight from medication and excipient mixes without any need for prior processing. This technique molds the powder mixture, additives, and water-soluble ingredients together under pressure into highly porous ODTs.

• Common side effects include headache, flushing, and nasal congestion.
• Serious side effects are rare but may include vision changes or priapism.
• Always consult with a healthcare provider before use.

This technology utilizes either solvent-based or heat-based molding techniques.

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In addition, the suitable drug candidate must exhibit these ideal characteristics. The drug should have a pleasant taste, lesser and moderate molecular weight, and excellent stability and solubility in water and saliva; remain partially unionized at the neutral pH of oral cavity; and easily permeate through the oral mucosal tissue [Citation4]. lists the advantages and disadvantages of the ODF, respectively. The existence of numerous polymers, excipients, and manufacturing technologies has leveraged the development of a distinct range of ODFs [Citation13]. The constituents of oral films can vary depending on the particular formulation and intended purpose [Citation16].

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Irrespective of the site of action, local or systemic, a wide range of drugs can be formulated as ODFs. Those films that are indicated for fluid-filled blisters, local anesthetics, toothaches, and mouth ulcers are few examples of ODFs that exhibit local action. For systemic action, they are used for managing cough, throat pain, migraine headaches, central nervous system disorders, gastric ailments, pain, and nausea or for delivering vitamins or nutraceutics [Citation6]. To start with ODTs, there are two broad classifications used in their manufacturing such as lyophilized systems and compressed tablet-based systems [Citation4,Citation13,Citation15,Citation17,Citation18]. The performance of ODTs relies on manufacturing processes that increase the tablet’s porous structure, ensures appropriate mixing sildenafil 20 mg tablets of disintegrating agents, and employs highly water-soluble excipients that allow quick ingress of water.

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These parameters are highly essential in facilitating rapid disintegration and dissolution of ODTs when placed in the mouth [Citation19]. Also, a striking balance between rapid disintegration and fragility must be demonstrated to reduce the challenges during handling, packaging, administration, and storage. Lyophilization, also known as freeze drying, is a technique that utilizes the sublimation effect, wherein solid ice is transformed directly into vapor phase, bypassing the liquid phase entirely, and often used to manufacture ODTs. This technology entails molding the drug in suspension or solution along with other structural excipients into tablet-shaped units, followed by freezing and lyophilization in the pack or mold forms. The resultant tablet-matrix offers high porosity, which is beneficial for rapid saliva or water penetration and quick disintegration [Citation20,Citation21].