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Wednesday, 08 July

Order Sildenafil at DoktorABC

Sildenafil is commonly used to treat erectile dysfunction. The medicine is named after its active ingredient, which was first used in Viagra. Sildenafil is found today in many generics of Viagra which are available at lower prices but are just as effective. The active ingredient starts taking effect about 30-60 minutes after ingestion and lasts for about 4 hours.

At DoktorABC you can order Sildenafil quickly and conveniently with an online prescription. Start your order by taking a minute to complete our short medical questionnaire. Our duty GP will immediately check whether Sildenafil is a safe option for you. If your prescription is approved our pharmacy will ship your order for next day delivery. Checkout price includes prescription, medication and next day delivery by UPS courier.

If Teva is not available, we will deliver the same medication from a different manufacturer.

Product information

What is Sildenafil?

Sildenafil is a medication for erectile dysfunction. It is a generic medicine derived from the well known branded medication Viagra. Sildenafil is a PDE-5 inhibitor and is the active ingredient in both Viagra, Viagra Connect and many other generic treatments.

The Sildenafil available at DoktorABC is produced by the manufacturer Teva and is fully licensed for UK patients. Sildenafil is subject to the same rigorous testing as its branded counterparts and meets the same high standards for safety and quality. But as a generic medicine it is cheaper, this is because manufacturers did not have to meet the original research costs.

If you have trouble achieving or maintaining an erection, Sildenafil can help you enjoy an active sex life.

How does Sildenafil work?

Sildenafil is a proven erectile dysfunction treatment that allows you to have sex at your convenience. Simply swallow one tablet before you want to have sex. It is recommended to wait a full hour to allow the medication to take effect.

The medication Sildenafil is named after its own active ingredient, which is the same PDE - 5 inhibitor used in Viagra. Sildenafil works to increase the flow of blood to the penis. If you are sexually aroused you will be able to achieve a full erection and have normal sex. The effects of a single Sildenafil tablet may last for up to 4 hours.

Who can use Sildenafil?

Sildenafil, as an active ingredient in various medications, has been prescribed to millions of men in dozens of countries. It has enjoyed a reputation as a safe and effective treatment for ED for over 20 years.

Sildenafil has helped users to manage their erectile dysfunction and enjoy sex normally. Its potential side effects are well understood and should not pose a significant problem to the majority of patients.

Unless you have certain specific medical problems, like high blood pressure, or are using a small number of non-compatible prescription medications, you will be able to use Sildenafil safely.

When you complete your confidential medical questionnaire, our online GP will immediately review your health profile and confirm that Sildenafil is the right medication for your needs.

Please read the Side Effects section for full information about whether Sildenafil is suitable for you.

What doses of Sildenafil are available?

DoktorABC’s online GP will review your health profile and approve the dosage that matches your medical needs.

Sildenafil tablets are available at DoktorABC in 3 sizes:

  • Sildenafil 25 mg
  • Sildenafil 50 mg
  • Sildenafil 100 mg

Most patients will receive an initial prescription for Sildenafil 50 mg. Experience shows that this is the optimal dosage for the average man with ED symptoms. Your dosage can be easily adjusted if it is not effective, or if you experience unwelcome side effects. 

Erectile dysfunction in younger men is often psychological in origin. An initial 25 mg prescription may be enough to boost their self confidence and help them to overcome their condition.

Men over the age of 70 may be more vulnerable to side effects from Sildenafil. A 25mg dosage is usually recommended as a first prescription. It has been found to balance the beneficial therapeutic effect with a lower risk of side effects. A 25 mg dosage can be adjusted as required.

How to take Sildenafil

Swallow a single tablet with a glass of water 30 minutes to 1 hour before commencing sexual activity. The effects of each tablet may last up to 4 hours. 

Do not take more than one tablet at a time and do not use Sildenafil on a daily basis. If you want to have sex more than twice a week you may require a different brand of erectile dysfunction medication such as Cialis Daily

When you complete your confidential medical questionnaire, our GP will immediately review your health profile and prescribe the most suitable medication for your treatment.

For Sildenafil to be effective you must be sexually aroused. Do not use this medication unless you are planning to have sex and do not take it when drinking alcohol.


Taking a heavier dosage of Sildenafil will not result in a better quality or longer lasting erection, nor will it enhance your sexual performance or level of sexual arousal. If you exceed your prescribed dosage you will increase the risk of unwelcome side effects. 

What are the side effects of Sildenafil?

Sildenafil has been used as an active ingredient in various ED medications for over 20 years. The majority of patients will not suffer from serious adverse reactions. Some may experience minor side effects that are easily manageable. 

Nonetheless, you should be aware of possible adverse reactions before you begin your treatment. 

Possible common side effects

Most patients do not experience any serious side effects when using Sildenafil, but the following common side effects may occasionally occur in some users:

  • Headache
  • Nausea
  • Facial flushing
  • Hot flush
  • Indigestion
  • Colour tinge to vision
  • Blurred vision
  • Visual disturbance
  • Stuffy nose
  • Dizziness

Possible adverse reactions

On rare occasions patients may experience an adverse reaction to Sildenafil. If you experience any of the following symptoms you should discontinue your treatment and seek immediate medical advice.

Sudden wheezing, difficulty in breathing or dizziness, swelling of the eyelids, face, lips or throat.

  • Chest pains
  • Priapism
  • A sudden decrease or loss of vision
  • Serious skin reactions possible with fever.
  • Seizures or fits

If you experience serious discomfort, we recommend that you go straight to your nearest casualty department. In an emergency dial 999.


Your prescription will come with a patient leaflet giving detailed information about the medication, its ingredients, possible side effects and contraindications. Please read this leaflet carefully before you begin taking your tablets, and retain the leaflet for future reference.

When not to take Sildenafil

DoktorABC’s online GPs generally do not recommend combining any erectile dysfunction medication with excess alcohol. Drinking to excess may reduce the effectiveness of your erectile dysfunction tablet, adversely affect your sexual performance and cause unwelcome side effects.  

Do not take Sildenafil if you have experienced any of the following:

  • Recent heart attack
  • Recent stroke
  • Low blood pressure
  • Severe cardiac problems or heart disease
  • Severe liver problems or liver disease
  • Rare inherited eye disease
  • Non-arteritic anterior ischaemic optic neuropathy (NAION)

Do not take Sildenafil if you are using any of the following medications:

  • Other PDE -5 inhibitors, like Sildenafil or Cialis (Tadalafil)
  • CYP3A4 inhibitors
  • Guanylate cyclase stimulators
  • Alpha-blockers
  • Nitrates (including recreational use of poppers or amyl nitrate)

If you have any questions about your ED treatment you can login to your DoktorABC account and begin a free confidential consultation with an online GP.

You can quickly renew your Sildenafil prescription at DoktorABC with free next day delivery.  Simply complete our online medical questionnaire to begin.

Leaflet info
The Patient Information Leaflet (PIL) is the leaflet included in the pack with a medicine. It is written for patients and gives information about taking or using a medicine. It is possible that the leaflet in your medicine pack may differ from the PDF-version from this website because it may have been updated since your medicine was packaged or the medicine is from another brand.

Our Service in 3 Simple Steps

1. Start your order

Complete a simple online health questionnaire

2. Select preferred treatment

Our GP will issue your prescription, if the medication is safe for you

3. Next day delivery

You will receive your medication the next day

Start your order

Complete a simple online health questionnaire

Select preferred treatment

Our GP will issue your prescription, if the medication is safe for you

Next day delivery

You will receive your medication the next day

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