Private vs NHS prescriptions online: what actually differs
The NHS and private providers are not two prices for the same thing. They are two different systems with different funding, different rules about what can be prescribed, and different answers to the question of who decides. Knowing which one you are actually using explains most of what people find confusing about buying medicines online.
Disclaimer: PenCompare is an independent comparison platform. This guide is for informational purposes and does not replace professional medical advice.
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The two routes at a glance
The short version, before the detail.
NHS prescriptions
Publicly funded treatment, prescribed within national guidance and dispensed against a flat charge rather than the medicine’s real cost.
- A flat charge per item in England, whatever the medicine costs the NHS
- Free in Scotland, Wales, and Northern Ireland
- Wide exemptions, and prepayment certificates for regular users
- Sent electronically to a pharmacy you nominate
- Limited to what NICE guidance and your local formulary support
- Waiting times depend on GP and service capacity
Private prescriptions
You pay the true cost of the medicine plus the service around it, in exchange for faster access and a wider range of treatments.
- You pay the actual price of the medicine, which varies a great deal
- A consultation fee on top, and sometimes dispensing or delivery fees
- No exemptions, and prepayment certificates do not apply
- Available across the whole UK on the same terms
- Includes treatments the NHS does not routinely fund
- Usually same-day or next-day assessment
Neither column is the better one. Which applies to you depends on what you need, where you live, and whether the NHS routinely funds the treatment in question.
How NHS prescriptions work online
An NHS prescription is written by a clinician working within the NHS, usually your GP, and is funded publicly. What you pay is a fixed charge that has no relationship to what the medicine actually costs.
The Electronic Prescription Service
Most NHS prescriptions in England are now sent electronically rather than on paper. You nominate a pharmacy, and prescriptions go there automatically. Some online pharmacies are registered NHS contractors and can be nominated in exactly the same way as a high street one, which is how NHS medicines get delivered to your door without anything being private about the transaction.
What you pay
Charges apply in England only. Scotland, Wales, and Northern Ireland do not charge for NHS prescriptions at all. For the 2026/27 financial year the England figures are:
- £9.90 per item, frozen for a second year
- £32.05 for a three-month prepayment certificate
- £114.50 for a twelve-month prepayment certificate
- £19.80 for an annual HRT prepayment certificate
These are reviewed annually and should be re-checked each April. Note that the charge is per item, not per prescription form, so three medicines on one form means three charges. A large majority of NHS prescriptions are dispensed free under the exemption categories, which cover age, certain benefits, pregnancy, and a defined list of medical conditions.
How private prescriptions work
A private prescription is written by a prescriber working outside the NHS. Nothing is subsidised, so you pay what the medicine genuinely costs, plus the cost of the service that assessed you.
That usually breaks down into some combination of:
- The consultation or assessment fee, sometimes folded into the headline price and sometimes not
- The medicine itself, at a price that varies substantially between providers
- A prescription writing or dispensing fee, where the provider charges one
- Delivery, particularly for tracked or refrigerated items
Because none of this is fixed by the NHS, private prices for the same medicine can differ widely between providers. That variation is precisely what a comparison is for, and it is the reason a headline price on its own tells you very little.
What each route actually costs you
The comparison people expect to make is price against price. The more useful one is this: on the NHS you pay a fixed charge regardless of the medicine’s value, so an expensive medicine is a bargain and a cheap one may cost you more than buying it outright. Privately you pay the real cost, so a cheap generic is genuinely cheap and an expensive branded product is genuinely expensive.
Two consequences worth knowing:
- If you are exempt from NHS charges, or hold a prepayment certificate, the NHS route is almost always cheaper for anything your GP can prescribe
- For a low-cost medicine, a private price can occasionally be lower than a single NHS charge — though this is the exception rather than a strategy
Why some treatments are private only
This is the difference that surprises people most. The NHS does not fund every licensed medicine for every person. What your GP can prescribe is shaped by NICE guidance at national level and by your local formulary, which sets out what is routinely available in your area.
Treatments commonly obtained privately include:
- Weight management medicines, where NHS access is tightly restricted by eligibility criteria and service capacity
- Hair loss treatments, which are generally not NHS-funded
- Some travel and preventive medicines
- Certain lifestyle and sexual health treatments
- Branded products where the NHS route would supply a generic equivalent
Being told the NHS will not fund something is not the same as being told it is unsuitable for you. It is also not the same as being told it is suitable. A private prescriber still has to assess you properly, and can still decline.
Worked example: weight loss injections
Weight management is the clearest example of the gap between the two routes, because the NHS criteria and the private criteria are set by different things. The NHS thresholds are shaped by what the health service can currently fund and staff; the private thresholds follow the medicine’s licence.
On the NHS. NICE technology appraisal TA1026 recommends tirzepatide (Mounjaro) for adults with a BMI of 35 or higher — 32.5 or higher for people of South Asian, Chinese, other Asian, Middle Eastern, Black African or African-Caribbean family background — together with at least one weight-related health condition. NHS England is releasing this in phases, so early access goes to those with the highest clinical need rather than everyone who meets the threshold. Since 1 April 2026 GP practices in England may also prescribe it under the 2026/27 GP contract, but taking part is optional, so availability varies from area to area. Specialist services have commonly reviewed treatment against a limit of around two years.
Privately. Prescribing follows the licensed criteria rather than the NHS rollout priorities, so the thresholds are lower: a BMI of 30 or higher, or 27 to 29.9 alongside a weight-related health condition such as type 2 diabetes, high blood pressure, high cholesterol or obstructive sleep apnoea. Meeting a threshold still does not guarantee a prescription. A registered prescriber decides after a full consultation, and will decline where treatment would not be safe for you.
| Feature | NHS | Private |
|---|---|---|
| Medication cost | £9.90 per item in England unless exempt; free in Scotland, Wales and Northern Ireland | £149 – £299 per month |
| Eligibility | BMI 35+ (32.5+ with ethnic adjustment) plus a weight-related condition, narrowed further by the phased rollout | BMI 30+, or 27 – 29.9 with a weight-related condition |
| Wait time | Months to years for specialist services; uneven by area | Often days |
| Choice of medicine | The prescriber and local formulary decide | Mounjaro, Wegovy, Saxenda |
Private prices are indicative and vary by provider, medication and dose. NHS figures are the 2026/27 England rates and should be re-checked each April.
Which route applies to you
A few questions usually settle it quickly.
- Does your GP prescribe this already, or could they? If yes, the NHS route is likely cheaper
- Are you exempt from charges, or in Scotland, Wales, or Northern Ireland? That shifts the maths further
- Is the treatment one the NHS routinely funds? If not, private may be the only realistic route
- Is the online provider you are looking at actually an NHS contractor, or a private clinic?
If you are unsure whether something could be prescribed on the NHS, ask your GP before paying privately. It costs nothing to ask, and the answer occasionally saves a great deal.