14 CLINICAL STUDIES

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5.3 Effects on the Eye
What other drugs will affect sildenafil?
5.6 Adverse Reactions with the Concomitant Use of Ritonavir
Side Effects
What happens if I miss a dose?
5.7 Priapism

Thermal analysis of the

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The Merck index: an encyclopedia of chemicals drugs and biologicals. Chapter 3: different thermal analysis and different scanning calorimetry. Thermal methods of analysis principles, applications and problems. Verma RK, Garg S. Compatibility studies isosorbide mononitrate and selected excipients used in the development of extended release formulations. antiretroviral zidovudine (AZT) and evaluation

Storage Parameter	Recommended Condition	Notes
Temperature	Keep below 25°C (77°F)	Avoid excessive heat or cold
Humidity	Store in a dry place	Protect from moisture
Light	Keep in original packaging	Prevent exposure to light
Shelf Life	2-3 years from manufacturing date	Check expiration date before use

of the compatibility with excipients

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used in solid dosage forms.

5.3 Effects on the Eye

Adulterated commercial products were used as a base and were spiked with 30 and 50 % w/w sildenafil RS to observe any shifting in the thermal peaks. From the analysis, the thermal characteristics of spiked samples A3a-2 and A3a-3 shifted slightly forward approaching the thermal characteristic of sildenafil in tablet form. The energy required to melt increased consistently with the incremental amount of sildenafil in the base (Fig. The thermal characteristic of spiked samples A3b-2 and A3b-3 were found to be similar to the sildenafil in tablet form but the peak resolution increased consistently with the spiking amount of sildenafil RS when compared to the pure adulterated commercial product A3b-1. The DSC curves of spiked samples A3b-2 and A3b-3 showed the peak of spiked sildenafil RS merged together with the original peak of the adulterated product with ∆H value of 134.86 ± 8.71 and 212.64 ± 8.82 J g−1, consecutively (Fig.

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The DSC outcomes showed that the thermal characteristics of spiked samples A3c-2 and A3c-3 were identical to the adulterated sample A3c-1. Its T m, H and T only differed about less than 2 °C and ∆H varied about 18 and 6 J g−1 for the spiked samples A3c-2 and A3c-3, respectively, when compared to the sildenafil RS (Fig. For the adulterated commercial product A3d-1, no melting peak was observed in the DSC curve. Surprisingly, the H which is similar to the peak of sildenafil in tablet form emerged in the curves of spiked samples A3d-2 and A3d-3. The results showed that both spiked samples were shifted backward about 6 and 4 °C for T m, shifted forward about less than 1 °C for H, and shifted forward about 3 °C for T when compared to the thermal characteristics of sildenafil in tablet form, while the ∆H value differed by about 55.44 and 96.99 J g−1, respectively (Fig.

What is sildenafil used for?

A qualitative analysis using the HPLC method was applied to all the adulterated commercial products to confirm the presence of sildenafil in these samples and to verify the DSC outcomes as well (Table 5). Figure 5a showed that two peaks emerged in the chromatogram. Using a photo-diode array detector the first peak at retention time (RT) 2.076 min was confirmed as a sildenafil peak from its UV spectrum. The second peak shown in chromatogram was an unknown peak, and therefore sample A3a was suspected to contain a mixture of sildenafil and other compounds. This was because the DSC curves of the spiked samples A3a-2 and A3a-3 showed more than one peak merged together and were not well separated. The authors would like to thank

What other drugs will affect sildenafil?

Therefore, it can be concluded that DSC can be used as a potential tool for fast detection of sildenafil in commercial products. Jung J, Hermanns-Clausen M, Weinmann W. Anorectic sibutramine detected in a chinese herbal drug for weight loss. Li L, Low MY, Lie X, Bloodworth BC, Koh HL. Isolation and structural elucidation of a new sildenafil analogue from a functional coffee.

Authors and Affiliations

A rapid micro quantification method of paracetamol in suppositories using differential scanning calorimetry. Tita B, Jurca T, Tita D. Thermal stability of pentoxifylline: active substance and tablets. Kumar N, Goindi S, Saini B, Bansal G. Thermal characterization and compatibility studies of itraconazole and excipients for development of solid lipid nanoparticles. the Malaysian National Pharmaceutical Control Bureau for

Condition	Description	Off-label Use	Contraindications
Erectile Dysfunction	To improve erectile performance	Pulmonary Hypertension	Nitrates use, severe cardiovascular disease
Pulmonary Arterial Hypertension	As a vasodilator to reduce pulmonary pressure	-	Use with caution in certain populations
Raynaud's Phenomenon	To improve blood flow in extremities	-	Severe hypotension

their assistance, and the University of Malaya

5.6 Adverse Reactions with the Concomitant Use of Ritonavir

Employment of differential scanning calorimetry in detecting lard adulteration in virgin coconut oil. Detection of butter adulteration with water using differential scanning calorimetry. In: Analytical profiles of drug substances and excipients, vol 27. Moffat AC, Osselton MD, Widdop B. Clarke’s analysis of drugs and poisons in pharmaceuticals, body fluids and postmortem material. for the financial support for this project.

Side Effects

The HPLC outcomes proved that sildenafil was present in samples A3b and A3c as the UV spectrum of the sildenafil RS exactly overlapped on the UV spectrum of samples A3b and A3c. 5d showed sildenafil presence in the sample A3d at RT 2 min. The RT of second peak emerged was identical to the RT peak of tadalafil and not sildenafil. This result was consistent with the DSC outcome, which was no peak appeared in the thermal curve around the T m of sildenafil RS and sildenafil in tablet form. The peak of sildenafil can be detected at amount of sildenafil more than 20 % w/w presence in the mixture.

How should I store sildenafil?

From the results obtained, it was found that DSC can detect sildenafil in sample A3a, A3b and A3c, but not in the sample A3d since the amount of sildenafil was too small as compared to other component in the sample. However, using the HPLC method, a small peak of sildenafil can be detected at RT 2 min in the sample A3d. Detection of adulterants in samples which contain many excipients in dosage form such as sachet will be very challenging. This is clearly sildenafil 130mg depicted in the curve of sample A3a. The melting point was shifted about 14 °C of the melting point of sildenafil in tablet form and this is may be due to the eutectic effect of the excipient.

What is the distribution configuration for this product package?

It was also found that the HPLC method only showed us what type of analyte is present in the sample but did not show whether the analyte presence was in a pure or mixture form, whereas DSC could differentiate the analyte presence and show whether it is in a pure or mixture form. From observation on the pattern of the DSC curve for samples A3b and A3c, we can conclude that the sildenafil mixture present in the sample A3b may be similar to the mixture of sildenafil in the tablet form; while sample A3c-1 was suspected to contain pure sildenafil instead of a mixture since its DSC curve pattern was identical to the pure sildenafil. The study shows that DSC detected sildenafil as an adulterant in commercial products. Sildenafil has a different shifting behaviour in different samples but the thermal curves of DSC are still reproducible for the sildenafil in pure and tablet form. The DSC curve itself shows the difference in patterns for sildenafil in pure form and mixture. Open Access This article is distributed under the

What happens if I miss a dose?

According to Haines and Wilburn [16], the melting point of the substance in mixture should show the same thermal characteristic as the pure substance if there is no physical or chemical interaction, otherwise it may shift forward or backward from the original pure substance’s melting point. This study showed that the sildenafil in the tablets had a lower T m (about 9 °C) and H (about 5 °C) compared with the sildenafil RS while the T was no different (Table 2). These two samples of sildenafil RS and sildenafil in tablet form consumed different amounts of energy to melt as we can see from the difference in the results of ∆H and the DSC curve patterns of both (Fig. These differences are due to the excipient content of the tablet as it is not 100 % sildenafil. To prove the H of sildenafil can shift at different concentrations, lactose was used as a base and was spiked with sildenafil RS between a range of 5–95 % w/w.

What does VIAGRA (Brand for SILDENAFIL CITRATE) look like?

The DSC curve of the pure lactose monohydrate consisted of two different endothermic peaks at 146–152 and 212–223 °C, respectively [17]. The first peak was the dehydration peak while the second peak was the melting peak of lactose which was followed by thermal decomposition [18]. As the result showed the T m of sildenafil shifted from 196.98 °C (100 % w/w sildenafil RS) to 204.43 °C (5 % w/w sildenafil RS), this demonstrated that the T m of sildenafil was influenced by increasing the amount of lactose (Table 3; Fig. Table 4 summarised the thermal characteristics of four different adulterated samples. The adulterated commercial product A3a-1 showed that the T m, H and the T shifted backward (about 14, 13 and 12 °C, consecutively) and consumed less energy to melt when compared to the sildenafil in tablet form.

What are the primary indications for this medication?

The thermal characteristic of the adulterated commercial product A3b-1 was found to be similar when compared with the sildenafil in tablet form with a T m of 188.37 ± 0.55 °C, H of 194.82 ± 0.12 °C and T of 200.73 ± 0.29 °C. The pattern of the DSC curve for A3b-1 was almost the same with the curve of sildenafil in tablet and the value of ∆H was only varied about 30 J g−1. For sample A3c-1, the thermal characteristic shifted backward only about 2 °C in the T m, H and T while ∆H varied about 40 J g−1 when compared to the sildenafil RS as opposed to the sildenafil in tablet form. For adulterated commercial product A3d-1, the DSC curve showed no peak around the thermal characteristic of sildenafil RS and sildenafil in tablet (Fig. As the shifting of the thermal peak varied among the adulterated commercial products, the spiking method was used to confirm that a particular thermal peak belonged to sildenafil. terms of the Creative

Sildenafil tablets LP 100 mg is approved by the FDA for ED treatment.
The medication can improve erectile response in men with ED.
Follow prescribed dosage instructions carefully for safety.

Commons Attribution License which permits

Contraindication	Reason	Alternative Action
Use of Nitrates	Severe hypotension risk	Avoid co-administration
Severe Cardiovascular Disease	Increased risk of adverse events	Medical consultation required
Hypersensitivity to Sildenafil or excipients	Allergic reaction	Discontinue use and notify healthcare provider
Concurrent use of Guanylate Cyclase Stimulators	Risk of significant hypotension	Seek medical advice before use

any use, distribution, and reproduction in any medium,

Men should not take sildenafil LP 100 mg if they have severe heart problems.
Use caution if you have low blood pressure or a history of strokes.
Always inform your doctor about current medications before use.

provided the original author(s)

Sildenafil tablets LP 100 mg is not an aphrodisiac; it enhances natural response.
Sexual stimulation is necessary for the medication to work effectively.
Discuss any underlying health conditions with your healthcare provider.

and the source are credited.

5.7 Priapism

Cordella C, Antinelli JF, Aurieres C, Faucon JP, Bass DC, Sbirrazzuoli N. Use of differential scanning calorimetry (DSC) as a new technique for detection of adulteration in honeys.1. Study of adulteration effect on honey thermal behavior. Detection of adulteration in Iranian olive oils using instrumental (GC, NMR, DSC) methods. Mansor TST, Man YBC, Shuhaimi M.