PT27, PT28 and PT33 in Thailand: a practical guide

What is PT27 (ภ.ท.27)?

PT27 is the report of the source and quantity of controlled cannabis kept at a licensed establishment. In practical terms, it is the inbound side of the stock trail: what arrived, when it arrived, who supplied it, and how much is held.

The official PT27 form asks for details including the acquisition date, the supplier and supplier licence, cultivation area where relevant, and the quantity of dried flower in grams. DTAM’s current guidance describes PT27 as a monthly report, so the underlying receiving records need to remain complete throughout the month.

A purchase invoice alone is not a complete stock trail. The received batch should also stay connected to its supplier documents, quantity, receiving branch, and any later movement.

What is PT28 (ภ.ท.28)?

PT28 is the report of how controlled cannabis was used at or supplied from the establishment. For a patient sale, it is the outbound side of the trail: which person received the cannabis, for what purpose, on what date, and in what quantity.

The official form includes fields for the buyer’s Thai ID or passport number, name, date of birth, purpose of use, and quantity. A business therefore needs more than a daily sales total. Each controlled movement must remain traceable to the relevant person or authorized recipient and the stock that left.

Sales are not the only movements that matter operationally. Returns, corrections, transfers, damage, and stock adjustments should remain visible rather than being used to overwrite the original history.

What is PT33 (ภ.ท.33)?

PT33 is the controlled-herb prescription for cannabis. It is issued by an authorized practitioner after a medical assessment; it is not a form that retail staff should create or approve themselves.

Current DTAM guidance says the prescription records the patient’s identity, the clinical condition or symptoms, the daily quantity, the number of treatment days, and the total quantity prescribed. The same guidance limits each prescription to treatment for no more than 30 days and requires the prescription evidence to be kept at the dispensing location for inspection.

At checkout, staff need to confirm that the patient and prescription match the proposed sale. The sale should not exceed the quantity or treatment context authorized by the practitioner.

How do PT27, PT28 and PT33 connect?

Think of the forms as one record chain. PT27 establishes the lawful source and quantity received. PT33 establishes the medical reason and authorized quantity for the patient. PT28 records the resulting use or supply from the establishment.

A clean retail flow is: receive a named batch from a documented source; verify the patient and current PT33; complete the sale from that batch; create the receipt and stock movement; then use those records to prepare or review PT28.

The forms do not replace one another. A valid PT33 does not prove where the product came from, and a PT27 source record does not authorize a patient sale. The trail is strongest when the same transaction connects all three contexts without staff retyping them later.

What should a cannabis business record?

For stock received, keep the supplier identity and licence, source documents, receiving date, branch, product, batch, and quantity together. For a patient sale, keep the patient identity, verified PT33 context, product, source batch, quantity, receipt, payment, branch, and staff member together.

Record each event once, when it happens. Re-entering data from paper receipts into a separate spreadsheet at month end creates mismatches in names, dates, quantities, and batch references.

Access also matters. Patient and prescription information should only be available to people whose role requires it, while operational and compliance staff still need a reliable audit trail of who recorded or reviewed each event.

Common mistakes that break the record trail

The most common problems are missing supplier licence details, receiving stock without a batch reference, selling from a generic product balance, attaching the wrong patient or PT33, recording only the receipt total, and editing a completed movement instead of posting a visible correction.

Another warning sign is a month-end balance that can only be explained in a private spreadsheet or chat thread. If the main operating record cannot show how opening stock became closing stock, the team is reconstructing the story instead of reviewing it.

What should be reviewed before reporting?

Reconcile each branch from opening stock through receipts, transfers, patient sales, other outbound movements, adjustments, and closing stock. Investigate negative stock, duplicate entries, missing batches, and records without the required source or patient context.

Check that the reporting month, licensee name, licence number, source details, patient or recipient details, dates, and quantities agree with the underlying records before filing.

How to report PT27 and PT28

Download the official forms above. Complete PT27 from the reconciled source and stock-receipt records, then complete PT28 from each use or supply movement for the same licensed establishment and reporting month.

DTAM’s current guidance describes both reports as monthly and says they must be submitted to the responsible authority within one month after the end of the month. Confirm the current filing channel and any licence-specific instructions with DTAM or the responsible provincial public health office before the deadline.

Keep the submitted forms, acknowledgement or receipt, and the accounts and evidence supporting every line for at least three years so they remain available for inspection.

This guide explains the record flow; it is not legal advice. Cannabis rules and operating requirements can change, and the responsible authority should be treated as the final source for your business.