Sildenafil Oral Suspension: Package Insert / Prescribing Info

All three formulations showed significantly increased solubility

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For the statistical calculation, SPSS Version 26 (IBM, Armonk, NY, USA) was utilised. A p-value of <0.05 was considered significant.33 Among the investigated ingredients, PVP and Labrasol were selected as a proper polymer and surfactant, respectively, due to their high solubility as shown in Figure S2-A and B. Afterwards, various amorphous microspheres were prepared (Table S1). To determine the optimal weight ratio of the drug, PVP and Labrasol, aqueous solubility and dissolution test were carried out as shown in Figure S3-A and B. As a result, the optimised amorphous microspheres were composed of PVP/ Labrasol/drug at the weight ratio of 6/1/1, showing the highest solubility and dissolution rate (%).

Physicochemical Properties of Various Sildenafil-Loaded Drug Delivery Sytems

The same configuration selected in the amorphous microspheres was utilised in the crystalline microspheres; however, this drug delivery system was produced using distilled water instead of an organic solvent. The final compositions of amorphous and crystalline microspheres are presented in Table 1. In this study, ingredients that maximise drug solubility were selected as components of SNEDDS, according to the previously published studies.20,31 The drug showed the highest solubility in Captex 300 among the oil stocks (Figure S4). Furthermore, Labrasol and Transcutol significantly increased the solubility of the drug, compared to others. Therefore, Captex 300, Labrasol and sildenafil uk price Transcutol were selected. compared to the drug powder (p < 0.05). Compared to the drug powder,

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amorphous microspheres, crystalline microspheres and solid

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Sildenafil Oral Solution	Generic or compounded brands	10 mg/mL	Often more affordable; compounded options
Revatio Oral Solution	Pfizer (for PAH)	10 mg/mL	Approved for pulmonary hypertension
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SNEDDS enhanced sildenafil solubility by 79, 55 and 82 times, respectively.

• The medication works by relaxing blood vessels in the penis.
• It increases blood flow, resulting in an erection during sexual activity.
• It requires sexual stimulation to be effective.

Additionally, amorphous microspheres and solid SNEDDS demonstrated highly

• It is not recommended for use in children or women.
• Overdose symptoms include dizziness, vision changes, and prolonged erections.
• Seek urgent medical help in case of overdose.

improved solubility compared with crystalline microspheres (p < 0.05).

7. Drug Interactions

Furthermore, irregular spherules with smooth surfaces were scattered in the solid SNEDDS (Figure 3D). HDK N20 Pharma is well reported to exhibit a highly porous surface and rough appearance.42,43 During the solidification process, oily liquid covered the porous surface of HDK N20 Pharma, resulting in the creation of a smooth surface. The particle-size distribution results are presented in Figure 4. The portions of particles with diameters below D50 are 50%. In tablet sildenafil 50 mg general, the value of D50 indicates the median diameter.

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The drug powder gave an average size of 26.6 ± 0.9 µm. In amorphous microspheres, a significant particle size reduction occurred (9.3 ± 1.0 µm), compared to sildenafil powder (p < 0.05). On the other hand, the crystalline microspheres exhibited a particle size of 27.8 ± 1.5 µm, similar to the particle size for the drug powder. The tendency of the particle-size analysis was consistent with the SEM results. The drug and ingredients were completely dissolved in ethanol and spray dried, leading to a decrease in particle size in the amorphous microspheres. Solid SNEDDS showed the highest aqueous solubility among the formulations, although

Ingredient	Concentration	Function	Notes
Sildenafil citrate	10 mg/mL	Active pharmaceutical ingredient	Main therapeutic agent
Purified water	-	Solvent	Ensures proper dissolution
Preservative (e.g., parabens)	0.1%	Prevent microbial growth	Preserves solution stability
Flavouring agents	-	Improve palatability	Fruit or mint flavors
Sweeteners	-	Mask bitterness	Aspartame or sucralose

there were no significant differences

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At specific time intervals (0, 5, 10, 15, 30 and 45 min), an aliquot (3 mL) of the sample was collected, filtered through a 0.45 µm nylon syringe filter and assayed for the content of sildenafil by employing HPLC, as described above. Twenty-four rats were non-selectively divided into four groups (each group consisted of six rats). After the anaesthesia process, the femoral artery of the rats was inserted with a surgical tube and fixed on a surgical board. Before surgery, heparin (50 IU/mL) was prepared to coat the inside of the polyethylene tube. The sildenafil-loaded amorphous microspheres, crystalline microspheres, solid SNEDDS and the drug powder were placed in a #9 gelatin capsule and administered orally at a dose of 20 mg/kg.

8.5 Geriatric Use

Plasma samples (300 µL) were collected at predetermined time points via the cannulated tube. After centrifuging the sample at 20,000 g for 10 min, the supernatant (100 µL) was separated. The protein precipitation method was applied while using revaprazan as an internal standard. Finally, the amount of sildenafil was analysed through HPLC. Statistically significant difference was confirmed by the Student’s t-test (for a pair of groups) and one-way ANOVA followed by Tukey’s post hoc test (for more than two groups). between solid SNEDDS and amorphous microspheres.

What Are Warnings and Precautions for Sildenafil?

The appropriate ratio of Captex 300, Labrasol and Transcutol was determined by the nanoemulsion-inducing ability and nanoemulsion droplet size, established in the previous methods.34,35 In the absence of sildenafil, the nanoemulsifying capability of liquid SNEDDS in water was evaluated along with visual standards as shown in Figure 2A. Among the formulations with superior self-nanoemulsifying ability, emulsion droplet size of each drug delivery system was investigated (Figure 2B and C). As a result, the liquid SNEDDS composed of Labrasol, Transcutol HP and Captex 300 at a weight ratio of 70/15/15% was chosen, generating the smallest droplet size (150.3 ± 2.7 nm). The small-sized nanoemulsion has better solubilising capability than large-sized nanoemulsion, due to the increased surface area in contact with water. Additionally, nanoemulsion with fine droplet size possesses wide range of drug loading capacity and excellent biocompatibility.

5.3 Epistaxis

For this reason, SNEDDS with small droplet is usually preferred.36,37 Subsequently, sildenafil was loaded into the liquid SNEDDS. A spray-drying technique was utilised for solidifying liquid SNEDDS. It is crucial to convert liquid form into solid form, since liquid SNEDDS has several drawbacks. Generally, liquid SNEDDS is encapsulated in soft gelatin capsules and these are susceptible to humidity. In addition, incompatibility issues between gelatin shell and liquid SNEDDS might occur in the soft capsules. The dissolution profile reflected the trend in aqueous solubility results (Figure 7).

Parameter	Value	Description	Notes
Absorption time	30-60 minutes	Time to reach peak plasma levels	Faster onset compared to tablets
Peak plasma concentration	150-200 ng/mL	Max systemic concentration	Varies per dose and individual
Half-life	4-5 hours	Time to reduce concentration by half	Helps determine dosing intervals
Bioavailability	40-50%	Fraction reaching systemic circulation	Slightly variable across patients

All of the manufactured drug delivery systems produced an enhanced dissolution rate

12. Sildenafil Oral Suspension - Clinical Pharmacology

The results of X-ray diffraction are depicted in Figure 5B. Several representative peaks are shown over a range of diffraction angles in sildenafil, indicating crystalline characteristics. Both physical mixtures exhibited similar peak patterns, similar to that of the drug powder. Conserving the designated peak pattern indicated that the drug presented good compatibility with the ingredients. The unique pattern was not observed in amorphous microspheres or solid SNEDDS.

Dosage Forms and Strengths

However, a peak pattern was detected for the crystalline microspheres, analogous to the sildenafil powder. Based on the thermal analysis and solid-state characterisation, the crystal form of sildenafil changed to an amorphous form in amorphous microspheres and solid SNEDDS, while it was preserved in the crystalline microspheres. As the drug was completely dissolved in ethanol or liquid SNEDDS, the physicochemical characteristics were altered in the amorphous microspheres and solid SNEDDS. Nevertheless, sildenafil was not dissolved but was suspended in distilled water for preserving the crystalline characteristics in the crystalline microspheres. Aqueous solubility results are presented in Figure 6. (%) compared to the drug powder at every sampling time (p < 0.05).

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In the preparation of crystalline microspheres, PVP and Labrasol were dissolved; however, hydrophobic sildenafil was undissolved in distilled water and the aqueous suspension was spray dried. Thus, the dissolved spray-dried hydrophilic excipients were attached to the undissolved spray-dried sildenafil, resulting in no significant change in particle size compared to the drug powder. In solid SNEDDS, the drug was completely dissolved in liquid SNEDDS before the solidifying process. Hence, the particle size of solid SNEDDS (10.4 ± 0.4 µm) was similar to that of amorphous microspheres; however, it was considerably reduced compared to pure drug powder. The outcomes of differential scanning calorimetry are depicted in Figure 5A.

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At 189 °C, a distinguishing peak was produced, showing crystalline characteristics; this result was consistent with the melting point of sildenafil. The correlative peak appeared in two types of physical mixtures. The results for the physical mixtures demonstrated that the drug maintained its crystallinity and there was no significant physicochemical interaction between the drug and excipients. The specific peak disappeared in the amorphous microspheres and solid SNEDDS. In contrast to the amorphous microspheres, a small endothermic peak was observed in crystalline microspheres, corresponding to the melting point of sildenafil. Solid SNEDDS presented superior dissolution rate (%) to other formulations.

In case of emergency/overdose

For those reasons, there are many studies solidifying liquid SNEDDS using spray dryer.38,39 In this study, HDK N20 Pharma was chosen as a solid carrier, due to its porous surface and high BET value (175–225 m2/g).40,41 The sildenafil-loaded liquid SNEDDS was dispersed in water and HDK N20 Pharma was suspended. Consequently, the suspension was spray dried to manufacture sildenafil-loaded solid SNEDDS. To fabricate free-flowing powder, 500 mg of HDK N20 Pharma was required in order to absorb 1000 mg of liquid SNEDDS. The surface morphological features were confirmed through a scanning electron microscope (SEM). Sildenafil exhibited irregular and oblong shape, assuming a crystalline solid form (Figure 3A).

Competing interests

Amorphous microspheres appeared as small spherical particles clustered together (Figure 3B). Compared to the drug powder, decreased particle size was observed in amorphous microspheres. Nonetheless, the SEM image of the crystalline microspheres indicated that the crystalline drug adhered to hydrophilic excipients, such as PVP and Labrasol (Figure 3C). Unlike the amorphous microspheres, the crystalline microspheres presented no significant particle size reduction, compared to the drug powder. However, the external region of the drug consisted of hydrophilic ingredients, which led to the production of an uneven surface in crystalline microspheres.