Question 1

What is a formulary, and why can't my doctor prescribe what I want?

Accepted Answer

A **formulary** is an approved list of medicines a health organisation supports prescribing — the mechanism by which a large system applies consistent, evidence-based and cost-conscious decisions rather than leaving every choice to individual preference.

**Why formularies exist:**

**Consistency.** Without one, identical patients receive different medicines depending on which clinician they saw.

**Evidence.** A committee reviews the evidence properly, which no individual prescriber has time to do across every therapeutic area.

**Safety.** Restricting routine prescribing to a reviewed set reduces error, and familiarity with a smaller range improves recognition of interactions.

**Cost.** Where several medicines are clinically equivalent, prescribing the cheaper one releases resources. **Differences between equivalent products can be very large**, and at population scale the sums are substantial.

**How they work.** Typically a traffic-light system: medicines suitable for routine prescribing in primary care; those requiring specialist initiation with ongoing prescribing shared; and those restricted to specialist use only.

**Why your doctor may decline a specific product:**

**A clinically equivalent alternative is available** at lower cost. For most medicines, the **generic** version is identical in active ingredient and bioequivalent, and the branded version offers nothing additional.

**The evidence does not support it** for your indication.

**It is restricted to specialist initiation.**

**It is not recommended by NICE** or the local committee.

**Where the distinction genuinely matters**, and prescribers should listen:

**Some products are not straightforwardly interchangeable.** Certain formulations — including some epilepsy medicines, modified-release preparations and thyroid medication — can produce different effects between manufacturers, and guidance recognises this.

**Excipients** — the inactive ingredients — differ, which matters for allergies and intolerances.

**Device familiarity**, particularly with inhalers, where technique is product-specific and switching without retraining reduces effectiveness.

**What to do if you believe a specific product is necessary:** explain the clinical reason rather than the preference; ask for it to be recorded; ask whether an individual exception process exists, which most systems have; and ask for referral where the decision requires specialist input.

General information, not medical advice.

Question 2

What does off-label prescribing mean?

Accepted Answer

It means a licensed medicine is being used outside the terms of its licence — a different condition, a different age group, a different dose or a different route than the one it was formally approved

Question 3

What is the difference between a pharmacist, a dispenser and a prescriber?

Accepted Answer

Different qualifications and different legal authority — and the roles have changed substantially, with many pharmacists now able to prescribe, which is not widely realised. Pharmacist. A registered

Question 4

Why does the same drug have several different names?

Accepted Answer

Because a medicine carries up to three distinct names serving different purposes, and confusing them is a genuine source of medication errors. The chemical name describes the molecular structure

Question 5

What do clinical trial phases actually mean?

Accepted Answer

Each phase answers a different question, and the questions get progressively harder — which is why most drugs that enter testing never reach patients. Preclinical. Laboratory and animal studies

Question 6

What is a drug interaction, and which ones actually matter?

Accepted Answer

One substance changing how another behaves in the body — either how much of it reaches the bloodstream and for how long, or what effect it has once there. Most interactions are theoretical or minor;

Question 7

How do NHS waiting lists actually work?

Accepted Answer

Not as a single queue. There are several different waits measured in different ways, and most public confusion comes from treating one number as though it described everything. The main pathways:

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