Adverse Event Reporting Timelines and Rules in Thailand

Adverse event reporting in Thailand follows a three-tier deadline system anchored to the date of awareness of the reporter. This page sets out the exact timeframes, the definition of a serious public health threat, the treatment of events occurring overseas, the submission channel and language requirements, and the misjudgements that most frequently cause late filings.

1. Key takeaways

Under the MoPH Notification B.E. 2563 (2020), the deadlines for adverse events occurring in Thailand fall into three tiers, counted from the date the reporter becomes aware of the event. The deadlines are immediate and no later than 48 hours for a serious threat to public health, immediate and no later than 10 days for death or serious injury, and 30 days where there is evidence that recurrence may lead to death or serious injury. Follow-up reports are due within 30 days of the initial report.

• Three-tier deadlines. Serious threat to public health: immediate, no later than 48 hours. Death or serious injury: immediate, no later than 10 days. Evidence that recurrence may lead to death or serious injury: within 30 days.
• Calendar days. The 10-day deadline counts calendar days, not working days. Thailand has no general 15-day adverse event deadline of the kind familiar from the European Union.
• Overseas events. Events occurring abroad are reported in semi-annual summaries: events from January to June are reported by the end of August of the same year; events from July to December are reported by the end of February of the following year. Devices manufactured in Thailand and sold domestically are reported as domestic cases. The Thai FDA may also request reports on its own initiative.
• Channel and language. Reports go to the Health Product Vigilance Center (HPVC), online or in person, on forms Ror Mor Por 1, 2 and 3. Reports must be completed in Thai on the official forms; English supporting evidence is acceptable, but the primary submission must be in Thai.

2. Legal basis

The deadline system derives from the MoPH Notification B.E. 2563 (2020), which governs the reporting of device defects, adverse events of consumers and field safety corrective actions. The three tiers apply to domestic events and are counted from the date of awareness of the reporter. The reporting channel is the Health Product Vigilance Center, using the prescribed official forms Ror Mor Por 1, 2 and 3, which must be completed in the Thai language, with the HPVC industry guidance of February 2021 confirming the forms and the use of IMDRF terminology codes. The notification also provides the semi-annual summary mechanism for events occurring overseas and reserves the authority of the Thai FDA to request reports on its own initiative.

The definition of a serious threat to public health covers events that create a risk of death, serious danger or serious illness and require immediate remedial action, including serious and unforeseeable danger to the public, or multiple deaths occurring close together in time.

3. Expert insights

Three misjudgements account for most late or incorrect filings in Thailand. First, importing the European 15-day deadline: Thailand simply does not have a general 15-day adverse event timeframe, so the EU framework maps incorrectly onto the Thai system. Second, treating the 10-day deadline as working days: it is calendar days, and this single reading error is the easiest way to miss the window. Third, confusing recurrence risk with actual harm: the Thai 30-day tier is triggered by evidence of a risk of recurrence, and does not require that actual harm has already occurred. This standard is closer to the European logic of an event plus a causal association, rather than the United States rule under which a malfunction that could cause serious injury is itself reportable.

The semi-annual summary mechanism for overseas events also deserves attention. Events occurring between January and June must be reported by the end of August of the same year, and events between July and December by the end of February of the following year. The Thai FDA retains the power to request a report at any time, and devices that are manufactured in Thailand and sold domestically are handled as domestic cases under the full three-tier deadlines.

4. Practical recommendations

• Define the date of awareness in the SOP. The most common practical failure is that the distributor learns of the event first and the licence holder only learns of it weeks later; the starting point is then assessed as the earliest date of awareness, and the window has largely elapsed before internal processing begins.
• Address this by agreeing in the distribution agreement that the distributor must notify the licence holder in writing within 24 hours of learning of an adverse event, and by setting the licence holder’s receipt of that notice as the internal timing baseline, while still calculating conservatively from the earliest date of awareness for external purposes.
• Prepare the Thai-language form templates in advance. Translating the forms under time pressure consumes precious days inside a 48-hour or 10-day window, so the templates should already exist when an event arrives.
• Keep the semi-annual overseas reporting calendar alongside the domestic deadline table, so that events recorded in the half-year registers are translated into filings by the end of August and the end of February respectively.

5. Verification checklist

• □ Confirm the three-tier deadlines of the MoPH Notification B.E. 2563 (2020): 48 hours, 10 days and 30 days.
• □ Confirm that the 10-day deadline counts calendar days, not working days.
• □ Confirm that follow-up reports are submitted within 30 days of the initial report.
• □ Confirm the semi-annual summary for overseas events: January to June reported by the end of August; July to December reported by the end of February of the following year.
• □ Confirm submission to HPVC on forms Ror Mor Por 1, 2 and 3, with the primary submission in Thai.
• □ Confirm the common misjudgements are addressed in procedures: the imported 15-day assumption, the working-day reading, and the misreading of recurrence risk as requiring actual harm.

How GRZAN can help. GRZAN provides medical device and IVD registration, quality system, authorised representative and local testing support across Southeast Asia, including Thailand. Our team prepares dossiers to ASEAN CSDT structure, manages submissions and deficiency responses with the Thai FDA, and supports post-market vigilance obligations. Business enquiries: info@grzanglobal.com