Do I need a T28 exemption to destroy controlled drugs?

Yes. A valid T28 exemption certificate is a legal requirement before any controlled drug destruction is undertaken at your premises, and it permits you to sort and denature CDs produced there. It lasts three years. Buying a denaturing kit does not give you permission to use it, and the common failure is a lapsed certificate rather than a missing one, because a lapsed T28 looks identical to a valid one until somebody checks the date.

Can patient-returned controlled drugs be destroyed without an authorised witness?

Yes. Patient returns in Schedules 2, 3 and 4 Part 1 may be destroyed without an Authorised Witness present. Good practice is that a colleague witnesses the destruction anyway and that it is logged. Keep those records separate from stock destructions, because the two answer different questions and should never be mixed in one entry.

What does a denaturing kit actually do?

It renders the medicine irretrievable. The kit chemically alters Schedule 2, 3 and 4 Part 1 medicines so they cannot be recovered and used, which is what makes it destruction rather than disposal. The drug is denatured first and only then becomes pharmaceutical waste leaving through your clinical waste route. A CD put in a waste bin without denaturing has not been destroyed.

What size controlled drug denaturing kit do I need?

Match it to how much you destroy between witnessed sessions rather than to the annual total. Roughly, 100ml to 250ml suits occasional patient returns and small practices, 1 to 5 litres suits regular community pharmacy volumes, and 20 litres suits high volume or batched destructions timed to a scheduled witness visit. Two smaller kits are often easier to manage than one large one.

Does destroying controlled drugs have to go in the CD register?

Destruction of Schedule 2 stock does, under the Misuse of Drugs Regulations 2001, alongside the records of Schedule 2 controlled drugs received and supplied. An inspection looks for entries that reconcile: a running balance that makes sense, a witness named against each destruction, and dates consistent with that witness having been available.

What happens to controlled drugs after they are denatured?

They become pharmaceutical waste and leave through your clinical waste contractor on the appropriate route. Your duty of care under the Environmental Protection Act 1990 applies in the ordinary way, so the carrier must be registered and the transfer paperwork kept. Denaturing changes what the material is; it does not remove your responsibility for where it goes.

Controlled Drug Destruction UK: Denaturing Explained

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Controlled Drug Destruction UK: Denaturing Explained | Optimised Medical Supplies

Destroying a controlled drug is not one procedure. It is two, they have different witness requirements, and the difference between them is where most of the trouble starts.

This covers what has to be in place before you destroy anything, who has to be watching, what goes in the register, and how to choose a denaturing kit that suits the volume you actually produce. Anything specific to your premises belongs with your Accountable Officer, and this is not a substitute for that conversation.

Get the T28 exemption first

This is the one people miss, so it goes first. A valid T28 exemption certificate is a legal requirement before any controlled drug destruction is undertaken on your premises. It permits you to sort and denature CDs you have produced, and it lasts three years.

Buying a denaturing kit does not give you permission to use it. If nobody at the premises can put their hand on a current T28, that is the thing to sort out before the next destruction rather than after an inspection asks. Three years passes quietly, and a lapsed certificate looks exactly like a valid one until somebody checks the date.

Stock and patient returns are different jobs

This is the distinction that decides who needs to be in the room, and it is worth being precise about.

For Schedule 2 stock, meaning CDs that belong to the premises and sit in your register, destruction must be witnessed by an Authorised Witness. That is a registered healthcare professional who is not responsible for the day-to-day use or management of controlled drugs at those premises. The independence is the point: somebody who is not part of the routine handling of that stock.

Patient-returned controlled drugs are treated differently. Returns in Schedules 2, 3 and 4 Part 1 may be destroyed without an Authorised Witness present. Good practice, and what most organisations require, is that a colleague witnesses it anyway and that the destruction is logged.

Schedule 2 stock: Authorised Witness required, and recorded in the CD register
Patient returns, Schedules 2, 3 and 4 Part 1: no Authorised Witness needed, colleague witness and a log
Keep the two records separate, since they answer different questions
Never mix stock and returns in the same destruction event or the same entry

Who can be an Authorised Witness

A provider nominates a registered healthcare professional who is not responsible for the day-to-day use or management of CDs at the premises, and that person applies to act as an authorised person. In a pharmacy that might be a pharmacist or a pharmacy technician; in a practice, a GP or a nurse.

The practical point is that this needs arranging in advance. An Authorised Witness is not somebody you find on the afternoon you want to destroy something, and stock accumulating in the cabinet while you wait for an appointment is its own governance problem.

What denaturing actually does

Denaturing renders the medicine irretrievable. A denaturing kit chemically alters Schedule 2, 3 and 4 Part 1 medicines so they cannot be recovered and used, which is what separates destruction from simply throwing something away.

The sequence matters. The drug is denatured first, and only then does it become pharmaceutical waste that leaves the premises through your normal clinical waste route. A CD that has gone into a waste bin without being denatured has not been destroyed, whatever the bin says on the side.

Different formulations behave differently. Tablets and capsules generally need to be removed from blisters so the denaturing agent can reach them, liquids are added directly, and patches and ampoules have their own handling. Read the instructions for the kit you have rather than the kit you used somewhere else.

Choosing a kit size

Kits run from 100ml up to 20 litres, and the right size is the one that matches how much you actually destroy between witnessed sessions rather than the largest you can justify.

A small kit that fills before the next Authorised Witness visit means stock waiting in the cabinet. An oversized one sits part-used for months, which is untidy rather than dangerous but makes the record harder to follow. If in doubt, two smaller kits are usually easier to manage than one large one, for the same reason two sharps bins beat one.

100ml to 250ml: occasional patient returns, small practices
1 to 5 litres: regular community pharmacy volumes
20 litres: high volume, or where destructions are batched to a scheduled witness visit
Match the size to the interval between destructions, not to the annual total

Expired stock, breakages and spillages

Not everything that needs destroying arrives there tidily. Three situations come up repeatedly and each is easier if it has been thought about before it happens.

Expired stock is the straightforward one. It is still stock, it is still in the register, and it still needs an Authorised Witness. The mistake is letting it accumulate quietly until there is an awkward quantity of it, which turns a routine destruction into something that looks like a problem.

A broken ampoule or a spilled liquid is harder, because some of the drug is now on the floor and cannot be accounted for by weight. What matters is that it is recorded contemporaneously, witnessed by whoever is available, and that the entry says plainly what happened rather than being tidied into something neater. An honest entry describing a spillage is unremarkable. A balance that quietly stops reconciling is not.

Anything you are unsure about goes to your Accountable Officer the same day, and your local standard operating procedure will say who to tell and how quickly. That is the part worth reading before you need it.

Expired stock: destroy on the normal cycle rather than letting it build up
Breakages and spillages: record at the time, witnessed, describing what actually happened
Do not wait to see whether the balance works itself out, because it will not
Know who your Accountable Officer is before the day you need them

A note on what it gets called

You will see the cabinet described as a CD cabinet, a controlled drugs cabinet, or a DDA cupboard. DDA is a survival from the Dangerous Drugs Act, long superseded by the Misuse of Drugs Act 1971 and the regulations under it, but the term persists in catalogues and in conversation.

They mean the same thing. If a supplier quotes you for a DDA cupboard they are quoting for a controlled drugs cabinet, and the specification is what matters rather than the label on the quote.

The register, and what an inspection looks at

Under the Misuse of Drugs Regulations 2001, records of Schedule 2 controlled drugs received and supplied are kept in the controlled drugs register, and that includes recording when Schedule 2 stock is destroyed.

What an inspection tends to look for is not just that the entries exist but that they reconcile: that the running balance makes sense, that destructions have a witness named against them, and that the dates line up with the witness being available. Entries written up later from memory show, and they show most clearly when somebody is trying to help.

After denaturing

Once denatured, the material is pharmaceutical waste and leaves through your clinical waste contractor on the appropriate route. Your duty of care under the Environmental Protection Act 1990 applies to it in the ordinary way, so the carrier has to be registered and the paperwork kept.

We have written that side up separately, because it catches people out on its own.

What we supply and what we do not

We stock controlled drug destruction and denaturing kits from 100ml to 20 litres, and lockable controlled drugs cabinets in a range of sizes. We do not hold or supply controlled drugs, we are not a waste carrier, and we cannot act as an Authorised Witness or advise on your specific governance arrangements. Those belong with your Accountable Officer.

Controlled drugs cabinet requirements, the storage side of the same subject
Clinical waste collection and duty of care, which is where denatured waste goes next
Clinical waste colour coding under HTM 07-01

Destruction and denaturing kits are stocked in our disposables range, and controlled drugs cabinets in healthcare furniture.

Frequently asked questions

Do I need a T28 exemption to destroy controlled drugs?: Yes. A valid T28 exemption certificate is a legal requirement before any controlled drug destruction is undertaken at your premises, and it permits you to sort and denature CDs produced there. It lasts three years. Buying a denaturing kit does not give you permission to use it, and the common failure is a lapsed certificate rather than a missing one, because a lapsed T28 looks identical to a valid one until somebody checks the date.
Who has to witness the destruction of Schedule 2 controlled drugs?: For Schedule 2 stock belonging to the premises, an Authorised Witness must be present: a registered healthcare professional who is not responsible for the day-to-day use or management of controlled drugs at those premises. The provider nominates them and they apply to act as an authorised person. In a pharmacy that might be a pharmacist or pharmacy technician; in a practice, a GP or nurse.
Can patient-returned controlled drugs be destroyed without an authorised witness?: Yes. Patient returns in Schedules 2, 3 and 4 Part 1 may be destroyed without an Authorised Witness present. Good practice is that a colleague witnesses the destruction anyway and that it is logged. Keep those records separate from stock destructions, because the two answer different questions and should never be mixed in one entry.
What does a denaturing kit actually do?: It renders the medicine irretrievable. The kit chemically alters Schedule 2, 3 and 4 Part 1 medicines so they cannot be recovered and used, which is what makes it destruction rather than disposal. The drug is denatured first and only then becomes pharmaceutical waste leaving through your clinical waste route. A CD put in a waste bin without denaturing has not been destroyed.
What size controlled drug denaturing kit do I need?: Match it to how much you destroy between witnessed sessions rather than to the annual total. Roughly, 100ml to 250ml suits occasional patient returns and small practices, 1 to 5 litres suits regular community pharmacy volumes, and 20 litres suits high volume or batched destructions timed to a scheduled witness visit. Two smaller kits are often easier to manage than one large one.
Does destroying controlled drugs have to go in the CD register?

All resources

Destroying Controlled Drugs: Denaturing, Witnesses and the T28

Related guides

Clinical Waste Collection: How It Works and Who Stays Responsible

Sharps Safety in Care Homes: The 2013 Regulations Explained