How to Build a Prescription Buffer Legally

What's a "Buffer"?

A prescription buffer means having 1-2 weeks of extra medication beyond your immediate needs. This gives you time to find supply if your pharmacy has a stock-out. It's not stockpiling — you're not hoarding months of supply.

How to Build a Buffer Legally

1. Order Prescriptions Promptly

Most GP practices allow you to reorder repeat prescriptions when you have 7-10 days of supply left. If you order at the earliest opportunity each time, you'll gradually accumulate a small buffer. For example, if you order with 10 days left and collect within 2 days, you gain 8 days' overlap each month.

2. Use the 28-Day Prescription Cycle

Standard NHS prescriptions are for 28 days. Calendar months are 30-31 days. Over several months, this slight mismatch naturally creates a small buffer if you reorder consistently on the same calendar date each month.

3. Ask About Slightly Longer Prescriptions

Some GPs will issue 56-day or 84-day prescriptions for stable, long-term medications. Longer prescriptions can be helpful during shortages as they give your pharmacy more flexibility in sourcing.

4. Don't Waste Medication

Ensure you're taking your medication correctly and not missing doses. Missed doses effectively create a buffer, but they also compromise your treatment.

What NOT to Do

Special Considerations for Controlled Drugs

Controlled substances (e.g., ADHD medications, some painkillers, benzodiazepines) have stricter prescribing rules:

• Usually limited to 30 days' supply per prescription
• Cannot be prescribed as repeat prescriptions — each requires a new, dated prescription
• Pharmacies may not dispense if the prescription is more than 28 days old
• Building a buffer is harder but not impossible — consistent early ordering helps

Related

See also