Written by elara veymont, Pharma-D

Medically reviewed by Dr. Aditya Shah, MD

Published October 12, 2026 Updated October 13, 2026

4.5 / 5 16 reader reviews

Trusted by 250,000+ Australians Real customers. Real experiences.

Cenforce is a generic brand of sildenafil citrate, a prescription medicine used to treat erectile dysfunction (ED) in men. It is manufactured by Centurion Laboratories, an Indian pharmaceutical company. Cenforce contains the same active ingredient as the branded medicine Viagra, but it is not approved by the Therapeutic Goods Administration (TGA) in Australia and is not registered on the Australian Register of Therapeutic Goods (ARTG). This article explains what Cenforce is, what it is used for, how its active ingredient works, and the safety information Australian consumers should know. It is provided for general information only and does not replace advice from a qualified healthcare professional.

Cenforce Active Ingredient: What Is Sildenafil?

The active ingredient in Cenforce is sildenafil citrate. Sildenafil is a selective inhibitor of cyclic guanosine monophosphate (cGMP)-specific phosphodiesterase type 5 (PDE5). It was originally approved by the U.S. Food and Drug Administration (FDA) in 1998 under the brand name Viagra and has become one of the most widely studied and prescribed treatments for erectile dysfunction.

Sildenafil belongs to a class of medicines called PDE5 inhibitors. These medicines work by improving blood flow to the penis during sexual stimulation. Sildenafil does not cause an erection on its own sexual stimulation is required for it to work.

Cenforce Sildenafil: Understanding the Difference

It is important to distinguish between what is verified about sildenafil as an active ingredient and what is not verified about Cenforce as a specific product:

• Sildenafil (the active ingredient): Has been studied extensively in clinical trials and is FDA-approved for erectile dysfunction. Its mechanism of action, side-effect profile, interactions, and contraindications are well documented in official prescribing information.
• Cenforce (the specific product): Is not TGA-approved in Australia and is not registered on the ARTG. It has not been assessed by the TGA for quality, safety, or efficacy. While it contains the same active ingredient as Viagra, the product itself has not undergone Australian regulatory assessment.

This distinction matters because the safety and quality of sildenafil as an active ingredient does not automatically extend to every product that contains it. A product that has not been assessed by the TGA may differ in formulation, quality control, and manufacturing standards.

Cenforce vs Sildenafil: What Is the Difference?

Cenforce and sildenafil are related but not identical terms:

• Sildenafil is the active ingredient, the actual molecule that produces the effect. It is the generic name of the medicine.
• Cenforce is a brand name for a product that contains sildenafil citrate. It is one of several generic brands of sildenafil manufactured internationally.
• Viagra is the original FDA-approved reference brand of sildenafil, manufactured by Pfizer.

The active ingredient is the same across these products, but the regulatory status differs. Viagra and several TGA-registered generic sildenafil brands are approved for supply in Australia. Cenforce is not.

What Is Cenforce Used For?

Cenforce is marketed for the treatment of erectile dysfunction (ED), the difficulty in achieving or maintaining an erection firm enough for sexual activity. The sildenafil in Cenforce is intended to support the ability to achieve and maintain an erection when sexually stimulated, by increasing blood flow to the penis through PDE5 inhibition.

Cenforce Uses: What It Does and Does Not Do

What it does:

• Helps improve blood flow to the penis during sexual stimulation
• Supports the ability to achieve and maintain an erection when sexually aroused

What it does not do:

• It does not automatically create an erection, sexual stimulation is required
• It does not directly increase sexual desire or libido
• It does not permanently cure ED
• It does not protect against sexually transmitted infections
• It is not a recreational medicine or performance enhancer for men without a diagnosed condition

Does Sildenafil Cure Erectile Dysfunction?

No. Sildenafil does not cure the underlying cause of erectile dysfunction. It is a symptomatic treatment, it helps manage the symptom (difficulty achieving or maintaining an erection) but does not address or reverse the underlying cause. ED can be a sign of an underlying health condition such as cardiovascular disease, diabetes, or hormonal imbalance. Identifying and treating the underlying cause is essential for long-term management.

Erectile Dysfunction Causes

Erectile dysfunction has multiple potential causes, which is why a medical assessment is important before starting any treatment. Causes can be broadly grouped into physical and psychological factors:

Physical causes:

• Cardiovascular disease (atherosclerosis, high blood pressure)
• Diabetes
• Chronic kidney disease
• Hormonal issues (low testosterone, thyroid imbalance)
• Nerve damage or neurological conditions (multiple sclerosis, spinal cord injuries)
• Prostate conditions and treatments (surgery, radiation)
• Penile conditions (Peyronie’s disease)
• Certain medicines (antidepressants, antihypertensives, antipsychotics)

Psychological causes:

• Anxiety, depression, or stress
• Performance anxiety
• Relationship problems
• Low self-esteem or negative body image

Lifestyle factors:

• Smoking
• Excessive alcohol consumption
• Lack of physical activity
• Being overweight or obese
• Illicit drug use

Because ED can be an early sign of cardiovascular disease or diabetes, it is important to consult a healthcare professional for a proper assessment rather than self-treating .

How Does Cenforce Work? (Sildenafil Mechanism of Action)

Sildenafil, the active ingredient in Cenforce, works through a well-understood biological mechanism:

1. Sexual stimulation: The brain signals arousal, and nerve endings in the penis release nitric oxide (NO).
2. cGMP production: Nitric oxide activates the enzyme guanylate cyclase, which increases levels of cyclic guanosine monophosphate (cGMP). cGMP relaxes the smooth muscle in the blood vessels of the penis.
3. PDE5 inhibition: Sildenafil blocks the PDE5 enzyme, which normally breaks down cGMP. By inhibiting PDE5, sildenafil allows cGMP to remain active for longer.
4. Increased blood flow: With cGMP levels maintained, blood vessels remain relaxed, allowing more blood to flow into the penis.
5. Erection: The increased blood flow supports an erection in response to sexual stimulation.

Key points:

• Sexual stimulation is required. Sildenafil does not cause an erection on its own — it enhances the natural response that begins with stimulation.
• Sildenafil does not affect sexual desire. It works on blood flow, not libido.
• The effect is temporary and tied to the active window of the medicine.

Sildenafil Onset of Action and Duration

The timing of sildenafil is well established from clinical studies and FDA-approved prescribing information:

• Onset: Sildenafil typically begins to work within 30 minutes after taking it. Studies show that the average time to onset of erections is 27 minutes, with a range of 12 to 70 minutes .
• Duration: The effects of sildenafil generally last up to 4 hours, although the action is usually less after 2 hours.
• Food: A heavy or high-fat meal can delay sildenafil absorption, pushing onset later. Taking sildenafil on an empty stomach or with a light meal may result in closer-to-typical onset.
• Frequency: Sildenafil should not be taken more than once in a 24-hour period.

Sildenafil Side Effects

Like all medicines, sildenafil can cause side effects, although not everyone experiences them. The following information is based on the FDA-approved prescribing information for sildenafil.

Common Side Effects

• Headache
• Flushing of the face
• Nasal congestion or runny nose
• Indigestion or heartburn
• Dizziness
• Temporary visual changes (such as a blue tint to vision)
• Muscle aches or back pain

These side effects are usually mild and tend to pass as the medicine wears off.

What Are the Serious Side Effects of Sildenafil?

Seek immediate medical attention if you experience any of the following:

• Prolonged or painful erection (priapism): An erection lasting more than 4 hours is a medical emergency. It can cause permanent damage to the penis if not treated. Seek emergency care immediately.
• Sudden vision loss in one or both eyes: This may be a sign of non-arteritic anterior ischemic optic neuropathy (NAION). Stop taking the medicine and seek medical attention.
• Sudden hearing loss or ringing in the ears: Stop taking the medicine and seek medical attention.
• Chest pain or irregular heartbeat: Seek emergency medical care.
• Severe allergic reaction: Rash, swelling of the face, lips, or throat, or difficulty breathing. Seek emergency care.

If you experience any of these serious side effects, stop taking the medicine and seek immediate medical attention.

Side Effects: Sildenafil vs the Specific Product

The side-effect information above is based on studies of sildenafil as an active ingredient, primarily from FDA-approved products. Cenforce has not been assessed by the TGA, and no Australian clinical data is available for this specific product. Side effects from unregulated products may differ due to variations in formulation, purity, or manufacturing standards.

Cenforce Safety Information

Who Should Avoid Sildenafil?

You should not take sildenafil (and therefore Cenforce) if you :

• Take nitrates in any form — including nitroglycerin, isosorbide dinitrate, isosorbide mononitrate, or amyl nitrite (“poppers”). The combination with sildenafil can cause a dangerous, potentially life-threatening drop in blood pressure.
• Take riociguat (Adempas) — a medicine for pulmonary arterial hypertension. The combination is contraindicated.
• Are allergic to sildenafil or any ingredient in the product.
• Have been advised by a healthcare professional to avoid sexual activity due to cardiovascular conditions.

Sildenafil Contraindications

The following are absolute contraindications for sildenafil :

• Concurrent use of nitrates (any form)
• Concurrent use of riociguat
• Known hypersensitivity to sildenafil or any component of the tablet
• Cardiovascular conditions where sexual activity is inadvisable

Sildenafil and Nitrates: Why This Combination Is Dangerous

Sildenafil and nitrates both lower blood pressure, but through different mechanisms. When taken together, the combined effect can cause a severe and potentially life-threatening drop in blood pressure. This is why the combination is absolutely contraindicated.

Nitrates are commonly prescribed for chest pain (angina) and heart conditions. People with diabetes, high blood pressure, high cholesterol, or heart disease are often prescribed nitrates, If you take any form of nitrate medicine, you must not take sildenafil. Always inform your healthcare provider about all medicines you take.

Speak With a Healthcare Professional First If You:

• Have heart disease, recent heart attack, recent stroke, or irregular heartbeat
• Have low blood pressure or uncontrolled high blood pressure
• Have liver or kidney problems
• Have a history of vision loss, including NAION
• Have conditions that predispose to priapism (sickle cell anaemia, leukaemia, multiple myeloma)
• Have a deformed penis (such as Peyronie’s disease)
• Take alpha-blockers (medicines for high blood pressure or prostate conditions)
• Take blood-pressure medicines
• Are over 65 years of age

Sildenafil Drug Interactions

Sildenafil can interact with several types of medicines. Always tell your healthcare provider about all medicines you take, including prescription, over-the-counter, and supplements.

Sildenafil and Alcohol

Both sildenafil and alcohol can lower blood pressure. When combined, they may cause dizziness, lightheadedness, or fainting — particularly when standing up quickly. Limit alcohol when taking sildenafil and discuss alcohol use with your healthcare provider.

Cenforce Australia: Is Cenforce Approved in Australia?

Sildenafil Is a Prescription Medicine in Australia

In Australia, sildenafil is classified as a Schedule 4 (S4) Prescription Only Medicine. This means a valid prescription from a qualified healthcare professional is required to obtain sildenafil from a licensed Australian pharmacy.

TGA-registered brands of sildenafil — including Viagra (Pfizer) and several TGA-registered generic equivalents such as Sildenafil Sandoz, are listed on the Australian Register of Therapeutic Goods (ARTG) and have been assessed for quality, safety, and efficacy.

Cenforce TGA Approval Status

Cenforce is not approved by the TGA and is not registered on the ARTG This means:

• It has not been assessed by the TGA for quality, safety, or efficacy.
• It is not legally sold through Australian pharmacies.
• It has not been reviewed for quality control, and purchasing it carries health risks.

The TGA has tested products containing undeclared sildenafil and found them to be illegally supplied, noting that such products have not been assessed for quality, safety, or efficacy and pose an unacceptable risk to consumer health.

How to Check Medicine Approval in Australia

Australian consumers can verify whether a medicine is approved for supply in Australia through the following official resources:

1. Australian Register of Therapeutic Goods (ARTG): Search the ARTG on the TGA website (tga.gov.au) by product name, active ingredient, or sponsor. If a product is listed on the ARTG, it has been assessed for quality, safety, and efficacy.
2. healthdirect.gov.au: Search for a medicine by brand name or active ingredient to see its scheduling status and whether it is available in Australia .
3. TGA eBS (PICMI): The TGA’s Product and Consumer Medicine Information repository allows searching by active ingredient to find registered products and their Product Information (PI) and Consumer Medicine Information (CMI) documents.

If a product is not listed on the ARTG, it has not been assessed by the TGA and is not approved for supply in Australia.

The Personal Importation Scheme

Australian residents may be able to import a personal supply of certain unapproved medicines under the TGA’s Personal Importation Scheme. However, this does not mean the product is TGA-approved or that its quality has been verified. Importing unapproved medicines carries risks, and the scheme has specific quantity and condition requirements that must be followed.

What This Means for Australian Consumers

• Do not assume Cenforce is equivalent to a TGA-registered medicine. While it contains the same active ingredient, the product itself has not undergone TGA assessment.
• Prescription required: Any source offering sildenafil-containing products without a prescription should be treated with caution.
• Verify the source: Always verify the regulatory status of any medicine through official Australian resources.
• Consult a healthcare professional: If you are experiencing ED, speak with a doctor. They can assess whether sildenafil is appropriate for you and provide a prescription that can be filled at a licensed Australian pharmacy with a TGA-registered product.

Medical Disclaimer

The information in this article is provided for general educational purposes only and does not replace advice from a qualified healthcare professional. Always consult a doctor before starting, stopping, or changing any medicine. This article does not constitute medical advice, diagnosis, or treatment. Cenforce is not TGA-approved in Australia and is not part of the regulated Australian medicine supply chain.

Sources:

• FDA-approved Sildenafil Citrate prescribing information, DailyMed, National Library of Medicine 
• Sildenafil (oral route), Mayo Clinic
• Onset and duration of action of sildenafil for the treatment of ED, PubMed Central (PMC)
• Symptoms & Causes of Erectile Dysfunction, NIDDK (National Institute of Diabetes and Digestive and Kidney Diseases)