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Erectile Dysfunction | Active ingredient(s): Sildenafil | Manufacturer: Various

Sildenafil is the generic version of Viagra. It contains the same ingredients. The recommended starting dose is 50mg.

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  • Review by a qualified doctor
  • Including prescription
  • Next-day delivery included

How does Sildenafil work?

It prevents the action of a chemical in the body called phosphodiesterase type 5. This chemical makes the arterial walls in the penis narrow, making it more difficult for blood to flow in and initiate an erection. Sildenafil works by relaxing the arteries and increasing the blood flow to the penis.

Although Sildenafil works quickly, in as little as 30 minutes, it will stay in your body for up to 4 hours. This does not mean that you will sustain an erection for this time, just that the drug is still active in your system. Without sexual stimulation from foreplay you will not achieve an erection. It may reduce the recovery time needed before you have sex again.

Dosage Information

Sildenafil comes in 25mg, 50mg and 100mg doses. You will most likely be started at 50mg to see how you handle that dose. Many people remain with that as they respond well to it, but some may need to be increased to 100mg to see an increased benefit from the medication. Conversely, some people will experience side effects and need to be switched to the 25mg dose, although the chance of this is low.

People over the age of 65 will be started on the lowest dosage. Additionally, people with liver or kidney problems, or those with HIV who are on protease inhibitors will also be given the lowest dose.

How to take Sildenafil

It should be taken with a glass of water a minimum of 30 minutes before you have sex. Never take more than one pill in a 24 hour period and always stick to the dosage that was prescribed for you.

Meals high in fat should be avoided as they will reduce the effectiveness of the medication. If a fat-containing meal cannot be avoided, then allow extra time after taking the pill before having sex. Excessive alcohol can also have a negative effect on the body and should be avoided.

If you have recently recovered from a stroke or heart attack then this medication may not be for you. Always tell the doctor about any changes to your health and any other treatment, prescription or over the counter, which you are taking.

Side Effects

Like all prescription drugs, some people may experience some sort of side effect after using this treatment. The most common symptom is a headache but it is possible to experience any of the following:

  • Dizziness
  • Indigestion
  • Facial flushing
  • Nasal congestion
  • Visual disturbances, such as blurred vision, blue tinge to vision

Not all possible side effects have been mentioned above. Make sure to read the patient leaflet that comes with the packaging to ensure you are familiar with your new medication and how best to avoid side effects. If you have any concerns then speak to your doctor about your options.

How to order Sildenafil

Should you be too embarrassed or too busy to visit your doctor, you can place an order online with 121doc. The first step is to complete our free consultation, where you will be asked to answer questions about your medical history and your condition. Secondly, you will be asked to fill out your home and delivery address. Finally you will be asked for your payment details. Once this is complete you will receive a confirmation email or SMS. At this time one of our doctors will review your consultation to ensure that you are suitable for the treatment you have chosen. If you are then a prescription will be sent to the pharmacy for immediate dispatch for delivery. If you are not suitable for this treatment then you won't be charged and you can find other erectile dysfunction treatments on 121doc that may be more suitable for you.

Your order will arrive in a plain Royal Mail envelope with no mention of 121doc or Sildenafil. All personal information that we collect is totally confidential and will not be shared with any parties.

Note: You must complete a short online consultation so that our doctor can ensure that the treatment is suitable for you. The above pricing should only be used as a reference. The final decision to issue this treatment lies with the prescribing doctor.


What is included in the online consultation?
Will a doctor review my consultation?
What happens after I submit my order?
Is the price all-inclusive?
Can I place more than one order at a time?
What are my delivery options?
Is it safe to buy prescription medication online?
How do I know which treatment is best for me?
Is this service discreet?
What is included in the online consultation?

Our consultations include general questions about your health (e.g. blood pressure levels, current and past conditions), as well as specific questions related to your selected treatment. We will also request relevant personal information to complete payment and delivery.

All questions are necessary, and your answers and details will not be shared with any third-parties. Only our doctors have access to your medical information.

Will a doctor review my consultation?

It is a legal and medical requirement that a doctor first reviews all completed consultations. We have a team of in-house doctors and specialists who will ensure your selected treatment is safe for your use. All information is stored securely and confidentially.

Please note, we do not guarantee that our doctors will approve treatment.

What happens after I submit my order?

Your consultation will be sent directly to our medical team, where it will be reviewed by one of our doctors.

If your chosen treatment is deemed suitable for your use, they will issue a prescription. Your prescription is then forwarded to our pharmacy, where your medication will be dispensed and dispatched for courier delivery.

Is the price all-inclusive?

Yes. All 121doc orders include a medical consultation, a prescription and next-day delivery. There are no additional costs. We believe in providing a safe and easy-to-use service.

Can I place more than one order at a time?

Yes. However, certain medications may negatively interact with each other. Our doctors may not approve your order on this basis.

You can place multiple items in one basket, and complete a consultation for all.

If you wish to place a second order for a different medication, you will have to complete a separate consultation.

What are my delivery options?

We offer several delivery options:

  • Next-day delivery
  • UPS Access Point - convenient parcel drop-off and collection near your home or work address
  • Nominated-day delivery - choose the most convenient day for delivery

All these options can be tracked and require a signature on delivery. If you are not available, a friend or relative can sign in your place.

None of these options will incur an additional charge.

Is it safe to buy prescription medication online?

To ensure you are purchasing from a reputable company, you should look to see their country’s regulatory bodies verify them.

In the UK, this is the Care Quality Commission (CQC) and the Medicines and Healthcare products Regulatory Agency (MHRA).Certificates can be viewed here.

How do I know which treatment is best for me?

Some treatments also offer the 'Advise Me' function. You will be asked questions about your lifestyle and needs, plus medical questions. You will then be presented with the advice of our doctors.

Is this service discreet?

Our patients’ privacy is of utmost importance. All your medical information is securely stored and only viewed by our doctors. We do not share your details with third-parties. We are also regularly inspected by various UK regulatory agencies, such as the Information Commissioner's Office (ICO).

All orders will only show on invoices, bank statements, etc. as ‘HHC Ltd’.

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How does it work?

Select Select your treatment and complete our online consultation.
Free consultation


Select a condition here or use the top menu. For every condition, we provide you with information as well as the treatments we currently offer. If you don’t know which is best for you, just click the 'Advise-me' button.


If you know what you want, the quickest way to find a specific medication is to use the search bar here.


Every order starts with an online consultation. We will ask you medical questions to make sure only treatment that is safe and effective is prescribed. We take into account your lifestyle, health and any other medications you’re currently using.

The consultation is completely free, and takes between 5 and 10 minutes of your time.

All your information is safe with us. We don’t share it with anyone unless you want us to.


If you need any guidance, you can call, message or email our customer service team via the ‘How can we help you?' section here.

Prescribe Our doctors review your order.
Free prescription


As soon as you place the order, one of our doctors will review your consultation. On working days, this usually takes around one hour.


If the doctor has any additional questions, you will receive a phone call and an email. We understand you might be at work or busy. Our customer service representatives are always discreet and can call back at a more convenient time if necessary.

Our emails never contain any personal or medical information, only a link to your private account on our website (where you will find your messages).


Once our pharmacy receives your prescription, you will get a second email with your package tracking code.

Deliver Expect your delivery the next working day.
Always free. Discreet packaging.
Free next-day delivery


All orders include next-day delivery. Alternatively, you can select a delivery date that suits you better.


We also provide a free UPS Access Point service. Pick up your package from one of many collection points across the UK.

With your tracking code, you will know the estimated delivery time. All we need is your signature (or a friend‘s or relative’s).


All parcels are plainly labelled; there is no logo or any indication of its contents. Inside, you will find your treatment as well as a patient leaflet in your chosen language.

Repeat Subscribe and save with our repeat service. Never miss a dose again.
10 to 15% off


With 121doc’s Subscribe & Save service, you can automatically receive your treatment every few weeks or months.

The order will be generated by us, using the information you provided (including delivery frequency). You don’t have to do anything. Payment is taken two days before shipping.


There are two ways to subscribe. The first is during the order process. The second is via your profile here.

You can cancel or amend your repeat prescriptions at any time.


There are no sign-up fees with this service. Plus, you get a 10% discount off all future prescriptions, increasing to 15% after six orders!