Assurans (Sildenafil Citrate) – Patient Information (UK)
Assurans contains sildenafil citrate, a medicine used to treat certain sexual health conditions. This page explains how it works, how to take it safely, what to expect, and important interactions and precautions for people in the United Kingdom.
Always read the patient information leaflet that comes with your medicine and follow the advice given by your healthcare professional.
Quick overview
- What it is: Sildenafil citrate (PDE5 inhibitor)
- Common use: Erectile dysfunction (impotence) in men
- How it works: Helps blood flow to the penis when you are sexually stimulated
- Typical onset: Often within 30–60 minutes
- Duration: Can last up to around 4 hours (may vary)
- Key safety point: Do not take with nitrates or “poppers” (risk of dangerous blood pressure drop)
Basic product information
| Item | Details |
|---|---|
| Medicine name | Assurans (Sildenafil Citrate) |
| Active ingredient | Sildenafil citrate |
| Medicine class | PDE5 inhibitor |
| Common indications | Erectile dysfunction in adult men (and, in some settings, pulmonary arterial hypertension—see below) |
| Routes | Oral tablets (swallowed with water) |
| Strengths | Available in different strengths (the exact strengths depend on the product you order) |
How Assurans works (mechanism of action)
Sildenafil belongs to a group of medicines called phosphodiesterase type 5 (PDE5) inhibitors. In erectile dysfunction, erections may be harder to achieve because blood flow to the penis is reduced or nerve signalling is less effective.
During sexual arousal, the body releases nitric oxide, which activates an enzyme pathway that increases cGMP. This helps smooth muscles relax and allows increased blood flow into the erectile tissue.
Sildenafil helps by:
- Inhibiting PDE5 (the enzyme that breaks down cGMP)
- Allowing cGMP levels to remain higher for longer
- Improving blood flow to support an erection when sexually stimulated
Important: Sildenafil does not automatically cause an erection. Sexual stimulation is still required.
Indications (what it’s used for)
In the UK, sildenafil is commonly used for:
- Erectile dysfunction (ED): Helps men achieve and maintain an erection suitable for sexual activity.
In certain specialist settings, sildenafil is also used for pulmonary arterial hypertension (PAH) as an alternative to other PAH medicines. The dose and product formulation may differ from ED dosing. If you are considering sildenafil for PAH, follow specialist guidance.
Pharmacokinetics (how the body processes it)
Pharmacokinetics describes how sildenafil is absorbed, distributed, metabolised and eliminated.
- Absorption: Sildenafil is absorbed after oral dosing. Peak levels typically occur within about 30–120 minutes.
- Onset and duration: Many people notice effects within 30–60 minutes. The effect may last up to around 4 hours, though this varies by individual.
- Distribution: Sildenafil distributes throughout the body and binds to plasma proteins.
- Metabolism: The liver metabolises sildenafil primarily via CYP3A4 (and other pathways).
- Elimination: Metabolites are mainly cleared via the faeces and urine.
- Half-life: The elimination half-life is commonly around 3–5 hours (individual variation occurs).
Because sildenafil is processed by the liver and kidneys, people with liver impairment or significant kidney impairment may need careful dose adjustments and closer medical advice.
Typical use and timing
Sildenafil is usually taken when you plan to have sex. To achieve best results:
- Take it at least 30 minutes before sexual activity (many people take it around 1 hour beforehand).
- Allow time for absorption—effects can be weaker or less predictable if taken too close to the planned time.
How long does it last? Effects often last for up to around 4 hours. If one attempt does not work, sometimes timing and stimulation can be adjusted for the next attempt (without exceeding the maximum daily dose).
Dosing (general guidance)
Dosing can vary depending on your health, age, and other medicines. Always follow the dose directions provided with your product.
Common starting approach (ED)
- Typical starting dose: Often 50 mg in adults.
- Adjustment: Your clinician may adjust to 25 mg (if sensitive or if side effects occur) or 100 mg (if needed and appropriate).
Maximum frequency
- In ED use, sildenafil is commonly taken no more than once per day.
Lower doses may be needed if you:
- Take medicines that interact with sildenafil (especially those affecting CYP3A4)
- Have liver impairment
- Have certain other health conditions
Missed dose: Sildenafil is used as required for sexual activity. If you miss the planned time, take it when you next plan to have sex (and within dosing limits).
How to take Assurans (practical tips)
- Swallow whole with water.
- Avoid heavy meals right before taking it (see food interactions below).
- Keep stimulation in mind: Sildenafil supports erection response, but it doesn’t replace arousal.
- Manage stress and pacing: Anxiety and rushing can make ED harder to treat.
- Hydration and lifestyle: Smoking, excess alcohol, and unmanaged cardiovascular risk factors can reduce effectiveness.
Food interactions
Food can influence how quickly sildenafil is absorbed. In general:
- High-fat or heavy meals: May delay absorption and delay onset of effect.
- Light meals/snacks: Usually less likely to affect timing.
Practical advice: If you want a predictable onset, consider taking sildenafil on an emptier stomach or at least wait after a heavy meal.
Alcohol interactions
Alcohol can affect both sexual performance and blood pressure. It does not directly “cancel” sildenafil for everyone, but:
- Excess alcohol may worsen ED and reduce confidence or stamina.
- Alcohol can contribute to light-headedness or increase the risk of low blood pressure symptoms when combined with sildenafil.
Safer approach: Keep alcohol moderate and avoid drinking to excess, especially on the day you take sildenafil.
Medicine interactions (important)
Sildenafil can interact with other medicines, sometimes causing serious side effects. The most critical interaction involves nitrates.
Do not use with nitrates
Do not take Assurans with nitrates (or nitrate-like medicines), including:
- Glyceryl trinitrate (GTN)
- Isosorbide dinitrate/mononitrate
- Any chest-pain “sprays”, tablets, patches or other nitrate therapies
This combination can cause a dangerous drop in blood pressure.
Avoid “poppers”
Do not use sildenafil with recreational inhaled nitrite products (often called poppers). This can similarly lead to a dangerous fall in blood pressure.
Riociguat (pulmonary hypertension)
Sildenafil should not be taken with riociguat (used for certain lung circulation conditions), due to risk of significant hypotension.
Alpha-blockers (prostate/urinary symptoms and some blood pressure medicines)
Taking sildenafil with alpha-blockers (such as tamsulosin or doxazosin) can sometimes lead to symptomatic low blood pressure, particularly around the time sildenafil starts working.
If you use an alpha-blocker, your healthcare professional may advise:
- Starting with a lower sildenafil dose
- Using at a suitable time separation
- Ensuring blood pressure is stable
CYP3A4 inhibitors (affect sildenafil levels)
Medicines that inhibit CYP3A4 can increase sildenafil levels, raising the chance of side effects. Examples include:
- Certain antifungals (e.g., ketoconazole, itraconazole)
- Certain antibiotics (e.g., clarithromycin)
- Some HIV medicines
- Some medicines for hepatitis C
- Grapefruit juice (may increase sildenafil exposure)
Practical advice: Inform your healthcare professional or pharmacist if you take any of the above or anything similar.
CYP3A4 inducers (reduce sildenafil effectiveness)
Medicines that strongly induce CYP3A4 can lower sildenafil levels, potentially reducing effectiveness. Examples may include:
- Rifampicin
- Some anti-seizure medicines (e.g., carbamazepine, phenytoin, phenobarbital)
- St John’s wort
Other ED medicines
Do not combine sildenafil with other PDE5 inhibitors (like tadalafil or vardenafil) to “boost” effect, unless specifically advised. Combining may increase the risk of side effects and low blood pressure.
Blood pressure and heart medicines
Sildenafil can interact with cardiovascular medicines by affecting blood pressure. If you have heart disease, angina, or a history of stroke, discuss treatment options with a clinician—especially if you take multiple blood pressure-lowering medicines.
Safety profile and side effects
Most people tolerate sildenafil well when used correctly, but side effects can occur. Common side effects are usually mild to moderate and often improve as your body adjusts.
Common side effects
- Headache
- Flushing (warmth/redness of the skin)
- Indigestion or nausea
- Blocked or runny nose
- Dizziness
- Vision changes (e.g., a bluish tinge or increased light sensitivity)
Seek urgent help if
Contact emergency services or seek urgent medical attention if you experience:
- Chest pain not resolving quickly
- Fainting or severe dizziness
- Sudden vision loss or severe eye pain
- Sudden hearing loss
- Priapism (an erection lasting 4 hours or more
- Severe allergic reactions (swelling of face/lips, difficulty breathing)
Special precautions
- Cardiovascular risk: Sexual activity itself is exertion. If you have unstable heart conditions, seek medical guidance.
- Low blood pressure (hypotension): Sildenafil can lower blood pressure further in some people.
- Severe liver impairment: Dose adjustment and extra caution may be needed.
- Severe kidney impairment: Extra caution may be needed.
- Bleeding disorders or stomach ulcers: Discuss risk if relevant.
- Conditions affecting erections: Caution in men with conditions like sickle cell anaemia or certain blood disorders.
When sildenafil may not be suitable
You may need to avoid sildenafil or seek tailored advice if you:
- Use nitrates for angina (or have been advised to take them)
- Use riociguat
- Have had a recent serious cardiovascular event and have not been cleared for sexual activity
- Have a history of non-arteritic anterior ischaemic optic neuropathy (NAION) (a type of vision impairment associated with PDE5 inhibitors)
- Have an eye condition requiring specialist care
Recent guidance and UK market context
In the UK, access to ED medicines is supported by established clinical guidance and increasing emphasis on safe supply. Key themes include:
- Safety screening: Providers aim to check cardiovascular risk, medication interactions (especially nitrates and riociguat), and suitability before supply.
- Cardiovascular evaluation: ED can be linked with underlying cardiovascular disease. A cautious approach helps reduce risk.
- Pharmacovigilance: Side effects should be reported through appropriate healthcare channels.
- Product quality: Online medicines are expected to be sourced from regulated supply chains and handled in line with UK legal requirements.
Important note: Guidance and availability can evolve over time. If you’re unsure about your suitability, consult a healthcare professional.
Delivery and availability in the United Kingdom
Assurans is typically supplied via online pharmacy services that operate within UK medicines regulations. Delivery arrangements can vary by provider, including:
- Dispatch times (often within 24–72 hours, subject to stock and verification)
- Delivery options (standard and sometimes tracked delivery)
- Packaging (discreet packaging is commonly offered)
Availability may depend on the strength you choose and local supply. If a particular strength is unavailable, you may be offered an alternative strength or a suitable comparable option.
Alternative options
If sildenafil (Assurans) doesn’t suit you, or if it isn’t effective, discuss alternatives with a clinician or pharmacist. Common options include:
- Other PDE5 inhibitors:
- Tadalafil (often longer duration; may be taken in different regimens)
- Vardenafil
- Avanafil (availability may vary)
- Non-medicine approaches:
- Addressing stress, anxiety, and relationship factors
- Improving sleep and reducing smoking
- Managing diabetes, blood pressure, and cholesterol
- Pelvic floor exercises
- Other medical options: Vacuum erection devices or specialist treatments if suitable.
Tip: Sometimes changing the timing, dose, or whether you take it with a lighter meal improves results.
Practical “best results” tips
- Plan ahead: Take it when you can be sexually stimulated without rushing.
- Start with the right strength: If you’re sensitive to side effects, a lower dose may help.
- Avoid heavy meals: For faster onset, don’t take it immediately after a large, fatty meal.
- Limit alcohol: Moderate alcohol is usually safer than heavy drinking.
- Be consistent: If your first attempt doesn’t work, the next attempt may benefit from adjusting timing and stimulation.
- Do not exceed dosing limits: More is not better and increases side effect risk.
FAQ – Assurans (Sildenafil Citrate)
1. Is Assurans the same as Viagra?
Assurans contains the same active ingredient, sildenafil citrate. Different brands may use different inactive ingredients and strengths, but the core effect comes from sildenafil.
2. How soon will it work?
Many people notice an effect within 30–60 minutes. Peak levels can occur in about 1–2 hours, and onset can be delayed after heavy or fatty meals.
3. How long does it last?
Effects commonly last for up to about 4 hours. Sensitivity and response vary from person to person.
4. Can I take it every day?
For erectile dysfunction, sildenafil is typically taken no more than once in a 24-hour period. Your product instructions may specify a more precise maximum—follow these carefully.
5. Will it work without sexual stimulation?
No. Sildenafil supports the erection response to sexual arousal. You still need sexual stimulation for best results.
6. What if I drank alcohol with it?
Moderate alcohol may be tolerated by some people, but excess alcohol increases the risk of dizziness and can reduce sexual performance. If you feel unwell or light-headed, avoid further alcohol and seek advice.
7. Can I take nitrates if I have chest pain?
If you use nitrates (including GTN) you must not take sildenafil. In an emergency, follow medical advice immediately. If chest pain occurs after sildenafil, seek urgent help.
8. Are there foods I should avoid?
Heavy or high-fat meals may delay onset. You may get a more predictable effect by taking it with a light meal or on a less full stomach.
9. Can I take it with tamsulosin or other prostate medicines?
Some alpha-blockers can lower blood pressure when combined with sildenafil. This doesn’t always mean “never,” but it may require a lower starting dose and careful timing—check with a pharmacist or clinician.
10. What should I do if I get side effects?
Common effects like headache or flushing often settle. If you experience severe symptoms (fainting, chest pain, vision changes, erection lasting more than 4 hours), seek urgent medical help.
11. Is it safe for everyone?
No. People with certain heart conditions, low blood pressure, liver or kidney impairment, or those taking interacting medicines may be at higher risk. Safety screening is important.
12. How can I maximise effectiveness?
Try taking it around 1 hour before sex, avoid heavy fatty meals beforehand, limit alcohol, and ensure sexual stimulation. If needed, discuss adjusting the dose with a healthcare professional.
Summary
Assurans (sildenafil citrate) is a PDE5 inhibitor designed to help men with erectile dysfunction achieve and maintain an erection during sexual stimulation. It typically starts working within about an hour and may last up to around 4 hours. For safe use in the UK, the most important considerations are avoiding nitrates and riociguat, being cautious with alpha-blockers and interacting medications, and recognising how food and alcohol can affect timing and side effects.
If you have questions about suitability, interactions, or the best way to take sildenafil for your situation, consult a pharmacist or healthcare professional.
