Method. Annual cost of paying per item = items × 12 × charge. 3-month PPC route = 4 × PPC price. 12-month PPC route = PPC price, flat. Break-even items per month = PPC price ÷ (charge × months covered) — below it, pay per item; above it, buy the certificate.

Worked example (2025/26 prices). At £9.90 an item, the 12-month certificate at £114.50 pays for itself at one item a month (12 × £9.90 = £118.80 > £114.50), and even 0.9 items a month tips it. A 3-month PPC at £32.05 needs at least 1.08 items a month to beat paying as you go — but a 12-month PPC beats four 3-months (£128.20) at almost every usage.

Who pays nothing. Under 16 (or under 19 in full-time education), 60 and over, pregnancy and the year after birth (maternity exemption certificate), a list of specified medical conditions with a medical exemption certificate (diabetes treated with medication, epilepsy, cancer under treatment, and others), NHS tax credit exemption, income-related benefits — and everyone in Scotland, Wales and Northern Ireland. Check your eligibility before buying anything; pharmacists can confirm.

Edge cases. HRT has its own cheaper 12-month certificate in England. Warfarin regulars, thyroid and blood-pressure patients on repeat items are the classic PPC winners. You can backdate-start some certificates to cover prescriptions already issued — ask when buying.

Primary source: NHS Business Services Authority PPC scheme and NHS prescription charge schedule (2025/26 figures used as editable defaults). Not financial or medical advice. Last reviewed 2026-09-21.