New Sildenafil Oral Film for Erectile Dysfunction – A Phase III Clinical Trial

What Is Sildenafil Oral Film and Why Is It Different?

Most men have heard of sildenafil. It is the active ingredient in Viagra. For more than 25 years, it has helped millions of men with erectile dysfunction. Sildenafil works by blocking an enzyme called PDE5. This allows blood vessels in the penis to relax and open wider. More blood flows in. An erection happens. But traditional sildenafil comes as a tablet. You need to swallow it with water. You need to wait 30 to 60 minutes for it to work. And you need to plan ahead. Now there is a new form. Sildenafil oral film. It looks like a small strip of breath freshener. You place it on your tongue. It dissolves in seconds. No water needed. No swallowing a pill.

This simple change could make a real difference for many men.

Here is who might benefit most from this new form.

• Men who have trouble swallowing pills. This includes older men and those with certain medical conditions.
• Men who want more spontaneity. A film that dissolves quickly can be taken discreetly and works faster than a tablet.
• Men who travel frequently or do not always have access to water.
• Men who simply prefer a more modern, convenient option.

The drug is the same. The delivery method is different. And that difference is what a new clinical trial set out to test. The link to the original study is here: A New Sildenafil Oral Film in Patients With Erectile Dysfunction

Study Overview: What Researchers Wanted to Learn

This study is a Phase III clinical trial. Phase III is the last stage of testing before a drug can be approved by the FDA. If a drug succeeds in Phase III, it can be submitted for approval. The researchers designed a rigorous study. It is randomized, meaning patients were randomly assigned to receive either the real drug or a placebo. It is double blind, meaning neither the patients nor the doctors knew who got which. This removes bias.

It is placebo controlled. The control group received a fake film that looked and tasted the same but contained no active drug. This allows researchers to see the true effect of sildenafil beyond the placebo effect. And it is multi center. Eighteen different clinics across the United States participated. This makes the results more generalizable.

Here are the key parameters of the study.

• 488 men with erectile dysfunction enrolled across 18 locations in the US.
• 4 week run in period with no treatment to establish a baseline.
• 12 week double blind treatment period.
• Flexible dosing from 25 mg to 100 mg based on response and tolerability.
• Men under 65 started at 50 mg. Men 65 and older started at 25 mg.

The primary goal was straightforward. Demonstrate that sildenafil oral film is safe and effective for treating erectile dysfunction.

Who Could Join the Study? (Eligibility Criteria)

Not every man with ED could join. The researchers set clear rules to ensure safety and to get clean results.

Men had to meet several requirements.

• Age 18 or older.
• A confirmed diagnosis of erectile dysfunction for at least 6 months.
• In a stable heterosexual relationship for at least 3 months.
• Willing to attempt sexual intercourse on a regular schedule.

These criteria ensured that the men in the study truly had erectile dysfunction and had the opportunity to use the treatment as intended. The exclusion criteria were even more important for safety. Some men were not allowed to join because sildenafil could be dangerous for them.

Here are the main safety exclusions.

• Men taking nitrates for heart disease. Combining sildenafil with nitrates can cause a life threatening drop in blood pressure.
• Men with severe liver or kidney problems.
• Men with unstable heart disease, recent heart attack, or stroke.
• Men with anatomical problems of the penis, such as Peyronie’s disease.
• Men who had radical prostatectomy or spinal cord injury.
• Men with a history of NAION, which is a type of sudden vision loss linked to sildenafil use.
• Men taking strong CYP3A4 inhibitors, which can increase sildenafil levels dangerously.

These exclusions are not arbitrary. They reflect real medical risks. Any doctor prescribing sildenafil, whether tablet or film, should check for these conditions.

How the Study Was Designed

It began with a screening visit. Interested men came in, learned about the study, and signed consent forms. Doctors reviewed their medical history and ran tests to confirm they qualified. Then came a 4 week run in period. During this time, men received no treatment. They simply recorded their sexual attempts using an electronic diary. This established a baseline. It also helped identify men who might not be compliant with the study procedures.

After the run in period, men who completed it properly returned for a randomization visit. They were randomly assigned to one of two groups. One group received sildenafil oral film. The other group received an identical looking placebo film. The treatment period lasted 12 weeks. Men used the film on demand before sexual activity. They could use it no more than once per day. The dosing was flexible. Men under 65 years old started at 50 mg. Men 65 and older started at 25 mg, a lower dose because older men process the drug more slowly and are more sensitive to its effects.

If the starting dose was well tolerated but not effective enough, the dose could be increased. Men under 65 could go up to 75 mg or 100 mg. Men 65 and older could go up to 50 mg. If side effects were bothersome, the dose could be decreased. This flexible approach mirrors real world practice. Not every man needs the same dose.

Study Design Summary for Sildenafil Oral Film Phase III Trial

Patients returned for visits every 2 to 4 weeks during the treatment period. They brought back used and unused film packages. They discussed side effects. They completed questionnaires about their erectile function and sexual encounters. At the end of 12 weeks, the study was completed. The code was broken. Researchers could finally see which men received sildenafil and which received placebo.

What Did the Researchers Measure? (Outcome Measures)

In a clinical trial, you cannot just ask patients “did it work?” You need precise, standardized measurements. This study used several established tools.

The first was safety. The researchers tracked specific side effects of special interest. Headache and dizziness were the primary safety outcomes. These are the most common side effects of sildenafil. They also tracked other vasomotor effects like flushing and nasal congestion.

The second was efficacy measured by the IIEF EF score. The International Index of Erectile Function Erectile Function domain is a six question survey. Men rate their ability to achieve and maintain erections over the past four weeks. Scores range from 1 to 30. Higher scores mean better erectile function.

The third was the Sexual Encounter Profile, or SEP. Patients completed this after each sexual attempt. Question 2 asks: “Were you able to insert your penis into your partner’s vagina?” Question 3 asks: “Did your erection last long enough to complete intercourse?”

These two questions are very practical. They get at the real world question that men care about. Can I get it in? Can I keep it long enough to finish?

Here is what SEP questions measure in simple terms.

• SEP Question 2 checks if the erection is hard enough for penetration. This is the first hurdle.
• SEP Question 3 checks if the erection lasts through intercourse. This is the second hurdle.
• The percentage of “yes” answers goes up when treatment works.
• A man who answers yes to both questions consistently has a functioning treatment.

The researchers also measured exploratory outcomes. These included overall treatment satisfaction on a 5 point scale from excellent to none. They measured the Global Assessment Questionnaire, which simply asks “has the treatment improved your erectile function?” They even asked about palatability. How did the film taste? Was the aftertaste pleasant or unpleasant?

These exploratory outcomes matter for real world use. A drug that works but tastes terrible will not be popular. A drug that works but leaves a bad aftertaste every time may lead men to stop using it.

Why a New Form of an Old Drug Matters

Sildenafil is not new. It was approved by the FDA in 1998. It has been studied in thousands of men. Its safety and efficacy are beyond question. So why develop a new form?

The answer is convenience and adherence. Many men do not take their ED medication as prescribed. Some do not like swallowing pills. Some forget to carry water. Some feel embarrassed taking a pill in front of their partner. An oral film solves several of these problems.

First, no water needed. The film dissolves on the tongue in seconds. A man can take it discreetly in a restaurant bathroom, in a car, or even in bed without getting up.

Second, faster absorption. When a tablet is swallowed, it must dissolve in the stomach and then be absorbed through the intestines. Food can delay this process. An oral film dissolves in the mouth and is absorbed directly through the lining of the cheek and under the tongue. This bypasses the digestive system.

Third, less food effect. A high fat meal can significantly delay and reduce the absorption of sildenafil tablets. The oral film may be less affected by food, though this study did not specifically test that.

Here are the potential advantages of the oral film over tablets.

• No need to swallow a pill. Helpful for older men or those with swallowing difficulties.
• No need for water. The film dissolves on its own.
• More discreet. The small strip can be taken without anyone noticing.
• Potentially faster onset. Absorption through the oral mucosa is quicker than through the stomach.
• Less variable absorption. Less affected by what you ate or when.

However, it is important to be clear. This is not a new drug. It is a new delivery system for an old drug. The active ingredient is exactly the same. The risks are exactly the same. The contraindications are exactly the same.

Special Considerations for Older Men and Men With Health Conditions

Older men are more likely to have erectile dysfunction. They are also more likely to have other health conditions. This study specifically included older men, with a target of 30 to 35 percent of participants aged 65 or older. The researchers made a smart design choice. They gave older men a lower starting dose. Men aged 65 and older started at 25 mg of sildenafil. Men under 65 started at 50 mg. This is because older men metabolize drugs more slowly. Their kidneys and livers work less efficiently. The same dose can lead to higher blood levels and more side effects.

If the sildenafil 25 mg dose was well tolerated but not effective enough, older men could increase to sildenafil 50 mg. They could not go higher than that. Men under 65 could go up to 100 mg if needed. The study also excluded men with certain medical conditions.

Men with severe liver impairment were not allowed to join. The liver breaks down sildenafil. If the liver does not work well, the drug can accumulate to dangerous levels. Men with severe kidney impairment were also excluded for the same reason. Men with uncontrolled diabetes were excluded. Diabetes causes vascular damage that can make ED harder to treat. Including men with very poor diabetes control could have confused the results. Men with a history of radical prostatectomy were excluded. This surgery often damages the nerves needed for erections. ED after prostate surgery is notoriously difficult to treat. The researchers wanted to study men with typical vascular ED, not post surgical ED.

At APUMN (Adult & Pediatric Urology Medical), we see many older men with ED. We also see many men with diabetes, high blood pressure, and high cholesterol. When we prescribe any form of sildenafil, we start with a lower dose for men over 65. We check their kidney and liver function. We review all their medications. Safety comes first.

Safety First: What the Study Is Watching For

Sildenafil is generally safe. But it has known risks. This study tracked them carefully. The most common side effects are related to blood vessel dilation. When blood vessels open up, some men experience headaches. The blood vessels in the brain dilate, causing pressure and pain. Flushing is another common effect. The skin, especially on the face and chest, becomes warm and red. This is harmless but can be bothersome. Nasal congestion happens because blood vessels in the nose also dilate. The nasal passages swell, making it harder to breathe through the nose. Indigestion or heartburn can occur because the muscle that separates the esophagus from the stomach relaxes. Acid can splash up. Dizziness can happen if blood pressure drops too much. This is usually mild but can be dangerous in some situations.

Here are the warning signs that require immediate medical attention.

• Chest pain or pressure. This could indicate a heart problem. Do not take another dose. Seek medical help.
• Sudden vision loss in one or both eyes. This is rare but has been reported with PDE5 inhibitors. Stop the drug and see an eye doctor immediately.
• Sudden hearing loss or ringing in the ears. Another rare but reported side effect.
• An erection lasting more than 4 hours. This is called priapism. It is a medical emergency. Without treatment, it can cause permanent damage and impotence.
• Severe dizziness or fainting. This could indicate a dangerous drop in blood pressure.

The most important safety warning is about nitrates. Men taking any form of nitrate medication for heart disease cannot take sildenafil. This includes nitroglycerin, isosorbide mononitrate, and isosorbide dinitrate. The combination can cause blood pressure to crash to fatal levels. This study excluded men taking nitrates. Any responsible doctor will check for this before prescribing.

Summary and What This Means for Patients

This Phase III clinical trial is an important step toward bringing a new form of sildenafil to market. The oral film offers potential advantages over traditional tablets. No water needed. Faster dissolution. More discreet. Potentially faster onset. But there are important things to remember.

First, this is an investigational drug. It has not yet been approved by the FDA. The study was completed in December 2024, but results have not yet been published. We do not know if the oral film performed better than placebo. We do not know if it was safe. We need to wait for the data.

Second, this is not a new drug. It is a new delivery system for a very old drug. Sildenafil has been used since 1998. The risks are well known. The benefits are well known. The only question is whether the film form works as well as the tablet and whether patients prefer it.

Third, the same safety rules apply. No nitrates. No use in men with severe heart, liver, or kidney problems. No use in men with certain eye conditions. The convenience of the oral film does not change the medicine’s risks.

Here are the main takeaways for patients.

• Sildenafil oral film is a new, more convenient way to take a proven medication.
• The Phase III trial is complete. We are waiting for results.
• If approved, this could be a good option for men who have trouble swallowing pills or want more spontaneity.
• The drug is not yet available. Do not look for it at your pharmacy.
• When it becomes available, the same precautions apply. Talk to your doctor.

Get a proper evaluation. Do not take it with nitrates.

In our clinic, we are always interested in new options that can help our patients. Convenience matters. If a man finds it easier to take an oral film than a tablet, he is more likely to use it consistently and get good results. But convenience does not replace safety. A thorough medical evaluation is still essential. Checking for contraindications is still essential. Starting with the right dose is still essential. We look forward to seeing the results of this trial. If the data is positive, we will offer sildenafil oral film to appropriate patients. If the data is negative, we will stick with the proven tablet form. Either way, the goal is the same. Help men with erectile dysfunction get safe, effective, convenient treatment that works for their lives.

Medical Disclaimer

The information provided in this article is for educational purposes only and does not substitute professional medical advice. Always consult a licensed healthcare provider for diagnosis and treatment recommendations specific to your situation.

Author

Shawn M. McGee, M.D.