Compounding: timelines, price and what is not included
Compounding is when a pharmacy prepares a medication specifically for you, rather than pulling a standard box off the shelf. They might change the dose, remove an allergen, turn a pill into a liquid, or add flavouring for a child. In London and other cities, this service sits somewhere between standard dispensing and specialist manufacturing. Not every clinic offers it, and those that do often work with external labs or have limited hours for custom orders.
What compounding actually means
The key thing to understand: compounding is bespoke. That means timelines stretch, prices vary, and certain things you might assume are included actually are not.
Realistic timelines you should expect
Standard prescriptions usually take 15 minutes to prepare. Compounded medications rarely take less than 24 hours, and many require 48 to 72 hours. Complex formulations, hormone therapies, or paediatric liquids with specific flavour profiles can stretch to five working days.
Ask directly: is this prepared on-site or sent to a central lab? On-site compounding sometimes moves faster for simple adjustments, like crushing a tablet into powder. Central labs offer more sophisticated equipment but add courier time. In Glasgow, for example, one clinic might compound basic creams in-house while sending hormone pellets to a facility in Manchester.
Refills need planning too. Do not assume your second bottle arrives faster than your first. The pharmacist still verifies your current prescription, checks for interactions, and confirms the formulation has not changed.
How pricing actually works
Compounded medications are rarely covered by standard NHS pricing structures. You might pay for the active ingredient, the base materials, the labour time, quality testing, and sometimes a consultation fee if the pharmacist reviews your case.
Request an itemised quote before authorising preparation. A hormone cream might list separately: oestradiol powder, permeation-enhancing base, sterile preparation time, and stability testing. Without this breakdown, comparing two clinics becomes impossible.
Some clinics in Bristol charge flat rates for common formulations while others bill by the minute of pharmacist time. Neither approach is inherently better, but you need to know which you are facing. Ask also whether follow-up adjustments, like tweaking the concentration after your first month, incur additional charges.
What the price typically excludes
Delivery fees often sit outside the quoted medication cost. Same-day courier within London might add fifteen to twenty-five pounds. Standard post is cheaper but offers no temperature control, which matters for certain creams and suspensions.
Storage containers are another hidden cost. Some formulations require amber glass, child-resistant caps, or specialised pumps. The clinic might absorb this or bill separately.
Consultation with the prescribing doctor is usually separate from the compounding fee. If your GP initiated the prescription but the clinic pharmacist needs to clarify details, confirm whether that conversation triggers an additional charge. In some cases, the clinic bills for pharmacist time even when you never speak directly to them.
Wastage policies matter too. If you cancel after preparation has begun, who pays for the materials already mixed? Most clinics retain 50 to 100 percent of the fee. Get this in writing.
Quality verification you should verify
Compounded medications lack the batch testing that factory-made drugs receive. Reputable clinics conduct in-house checks or use labs with UKAS accreditation. Ask specifically: who tests the final product, and what do they test for?
Potency testing confirms the dose matches the prescription. Sterility testing matters for injections, eye drops, or anything entering sterile body spaces. Stability testing predicts how long the formulation remains effective under specified storage conditions.
Request the certificate of analysis for your specific batch. Some clinics provide this automatically. Others require you to ask. If they cannot produce it, consider whether the price savings justify the uncertainty.
Documentation to keep and share
Compounded prescriptions create paperwork gaps. Your GP's electronic system might not recognise the specific formulation. Hospital emergency departments may not know what you are taking.
Ask the clinic for a standardised information sheet: generic name, exact strength, ingredients including bases and preservatives, preparation date, expiry date, storage instructions, and the pharmacy's contact details. Carry this with your NHS card.
When seeing specialists or travelling abroad, this sheet prevents dangerous assumptions. A hospital in Manchester once nearly duplicated a patient's hormone therapy because the compounded formulation did not appear in standard drug databases.
When to question whether compounding is necessary
Compounding solves real problems: allergies to standard fillers, need for precise paediatric dosing, discontinued medications, or specific delivery methods. It is not automatically superior to manufactured alternatives.
If a standard tablet exists in your required dose, using compounded liquid usually costs more and offers no clinical advantage. Some clinics promote compounding for conditions where evidence is thin. Ask directly: what does this formulation offer that I cannot get from a standard prescription?