Some of the most consequential medicines questions begin after the drug has been chosen. Does this brand contain lactose? Is there a liquid, and at what strength? Can this tablet be crushed for a feeding tube? Are the two versions of this antibiotic interchangeable? These are product-level questions, and the drug-level sources most clinicians reach for first are structurally unable to answer them, which is not a flaw but a division of labour. Here is how to work at product level quickly and safely.
Why the generic name is sometimes insufficient
One active ingredient can conceal a family of genuinely different products: different manufacturers, strengths, formulations and routes; different excipients; different licensed populations; different supplied devices. Ibuprofen makes the point vividly, ordinary oral preparations, children's liquids, topical gels, adult intravenous products and the specialist neonatal preparation share a name and almost nothing else that matters at the point of use. Nitrofurantoin makes it dangerous to ignore: standard and prolonged-release preparations are not interchangeable, and selected products contain lactose or sucrose, facts invisible at drug level. The professional reflex this article exists to install: whenever the question involves giving, swallowing, tolerating or substituting, drop from drug level to product level before answering.
Drug-led versus product-led sources
The source depends on the level of the question. Use applicable clinical guidance for treatment choice; eMC for the SmPC of the exact brand, strength and formulation, including excipients, storage and administration; dm+d for NHS product and pack identities; and iatroX Medicines as an orientation layer that surfaces formulation differences and links to each product source.
Where to check excipients
In order: the exact product's SmPC, section 6.1 carries the full excipient list, and it belongs to that product alone; the PIL for the patient-facing statement of the same; the pharmacy team or the manufacturer's medical-information service when the product in hand is unclear or the question is unusual; and specialist excipient references for the complex end, multiple allergies, intolerances interacting with multiple products. The mistake to design out: answering an excipient question from any drug-level source, or from a different manufacturer's version of the same medicine.
Where to check swallowing and enteral-tube questions
Crushing, opening, dispersing and tube administration are manipulation questions, and the honest starting answer is that not every tablet can be crushed nor every capsule opened; modified-release and enteric-coated products are the classic hazards. The workflow: the exact product's information first, since some SmPCs address it; SPS's practical guidance; and NEWT or an equivalent enteral-administration reference for the definitive product-by-product answer, with pharmacy involved whenever manipulation or substitution is being invented at the bedside rather than looked up.
Worked examples, compressed
Apixaban: distinct oral suspension products carry separate SmPCs, differing in excipients and supplied administration devices, and enteral and crushed-tablet questions are answered at product level; the apixaban page links each preparation's document. Amoxicillin: liquids differ in strength, reconstitution and post-reconstitution storage, and injectable products contain amoxicillin sodium with their own compatibility considerations; the amoxicillin page maps them. Paracetamol: adult tablets, more than one paediatric liquid strength, suppositories and intravenous products each demand their own reading, and the duplication risk across combination cold-and-flu products is a formulation fact with safety consequences: the paracetamol page leads with it.
The reusable workflow
Five steps, in order, for any product-level question: search iatroX Medicines and orient on which routes and formulations exist; identify the clinically live distinction, excipient, strength, release profile, device; open the exact relevant SmPC and read the numbered section your question lives in; check local availability or formulary status where substitution is in play, per /blog/how-to-find-use-local-nhs-formulary; and involve pharmacy or a specialist source before any manipulation or non-equivalent swap. Two minutes, and the class of error this article exists to prevent, right drug, wrong product, becomes hard to commit.
Frequently asked questions
Are branded and generic versions always equivalent?
Therapeutically equivalent for most immediate-release products; not necessarily equivalent in excipients, appearance or device, and for selected classes, modified-release preparations among them, brand consistency is deliberately maintained. The formulary and pharmacy know your system's position.
Who answers "can this be crushed" out of hours?
The exact product information plus NEWT where available, then the on-call pharmacist; improvisation is the one option not on the list.
Do excipient lists change?
They can, with reformulation, which is one more reason to check the current SmPC rather than memory, and why review dates on any secondary source matter.
Where do devices fit in this picture?
Inhalers, pens and pumps push the product-level logic further: technique, counters and interchangeability are device-specific facts, and switching brands can mean re-teaching the patient even when the molecule is identical. The exact product's information and the pharmacy team own this layer, and formulary brand choices often exist precisely to keep devices consistent.