Thailand Cannabis Records: PT 27, PT 28, PT 29 and PT 33

Cannabis compliance records answer different questions: where flower came from, how it was used or distributed, what was processed and who prescribed it to a patient. Treating PT 27, PT 28, PT 29 and PT 33 as interchangeable creates gaps that a completed-looking spreadsheet can conceal.

Start with the activities authorized by your establishment’s current licence. Record keeping supports those activities; submitting a form does not create permission for a new activity or cure an expired licence.

Which form does what?

Form	Main purpose	Practical distinction
PT 27 / ภ.ท.27	Source and quantity of controlled herb held	Connect receipts and holdings to their source.
PT 28 / ภ.ท.28	Use or distribution of controlled herb	Connect outgoing quantities to their destination or use.
PT 29 / ภ.ท.29	Processing and commercial sale of resulting products	A processing record, not a cultivation licence or a universal retail form.
PT 33 / ภ.ท.33	An individual cannabis prescription	Patient and prescribing details, distinct from an inventory report.

DTAM’s forms notice also provides forms for other activities, including research and export. Use the forms and instructions applicable to your operation. The June 2025 notice continued the earlier reporting forms and introduced PT 33. Download the original reporting forms and their instructions from DTAM.

Build a record from receipt to dispensing

The following is a suggested operational workflow, not a replacement government form.

1. At receipt: connect the supplier, their authorization, invoice, quantity and source evidence to a lot identifier. Resolve missing documents before accepting stock into the saleable inventory.
2. At storage: use one unit convention and retain the original measurement. Keep different harvests distinguishable even when they share a strain name.
3. At dispensing or another authorized use: record the date, lot and outgoing quantity, with the relevant supporting document. Keep patient records accessible only to staff who need them.
4. At closing: compare recorded movements with a physical count. Record the explanation for a difference instead of changing a receipt to force agreement.

For example, an opening balance of 100 grams plus a 50-gram receipt and 20 grams dispensed should leave 130 grams before any separately documented adjustments. If the count is 128 grams, investigate the two-gram difference. That example is bookkeeping arithmetic, not a permitted wastage allowance.

Keep prescriptions separate from stock totals

A total quantity sold is insufficient to demonstrate that each dispensing event had its required supporting record. Conversely, a folder of prescriptions will not show which supplier and harvest produced the flower dispensed.

Use a stable reference to connect records without copying sensitive patient details into every stock sheet. Ask the responsible professional how repeat dispensing is checked against the prescribed quantity. A copied document should never silently become another full allowance.

For the patient-facing explanation of these documents, see cards and PT 33 prescriptions.

Confirm the reporting schedule that applies

DTAM’s establishment guidance describes monthly PT 27/PT 28 reporting, record retention and procedures for losses. Older form attachments also contain submission instructions. Confirm the current deadline, submission channel and retention requirements for your licence with DTAM or the provincial public health office; do not rely on an old screenshot or a software vendor’s generic calendar. DTAM establishment guidance.

Maintain transaction records as events occur, then reconcile before the applicable submission deadline. Keep the submitted version and acknowledgement together so you can distinguish a draft from a filed report. Record who checked a correction and when it was submitted.

Software should make evidence easier to retrieve

Before choosing a system, try a small example: find one receipt, trace its lot to an outgoing transaction, locate the supporting document and reproduce the report total. Check how corrections are recorded, who can access patient information and whether you can export your own records.

A successful export does not prove that the source data or licence is correct. Assign a person to review exceptions such as missing supplier evidence, unmatched prescriptions, duplicate entries and unexplained stock differences. Our cannabis sourcing guide explains why source recognition and batch evidence need separate checks.

Updated 6 September 2026. This workflow is editorial guidance; the official Thai notices and instructions applicable to your establishment govern reporting.