Adult possession of up to 3g or one plant is the lowest police priority under a prosecutorial guideline, not a formal legal right. The medical program is essentially Sativex-only plus limited pharmacy-compounded preparations.
Cannabis is illegal in Belgium, but personal possession has been de facto decriminalized since a 2003 policy shift, formalized by a 2005 joint directive from the Justice Ministry and public prosecutors. Under that directive, an adult aged 18 or over found with up to 3 grams of cannabis (or one cultivated plant), without aggravating circumstances, receives a simplified police report rather than an arrest; the case is registered with the public prosecutor, who in most cases does not pursue criminal charges. In practice this typically results in a fine of roughly €120–200. — LegalClarity
This is a prosecutorial guideline, not a change to the underlying law — cannabis possession is still technically a criminal offense, and the guideline can be overridden by "aggravating circumstances": use in the presence of minors, near a school, in public in a way that causes disturbance, signs of problematic drug use, or possession above 3 grams. Any of these push the case back into the ordinary criminal track.
Sale, cultivation for supply and trafficking remain fully criminal. Belgium has no cannabis social club framework comparable to Spain's, and no legal recreational retail exists anywhere in the country.
Belgium's medical cannabis program is narrow. Sativex (nabiximols, an oromucosal spray) is the only cannabis-based medicine broadly authorized, for spasticity associated with multiple sclerosis. Separately, a 2019 royal decree allows pharmacists to compound individual "magistral preparations" on a doctor's prescription — but the only active ingredient permitted in these preparations is pure CBD; anything containing measurable THC is excluded. Since January 2025, pharmacists compounding CBD magistral preparations must follow the new European Pharmacopoeia monograph (07/2024:3151). From 1 May 2025, certain CBD-based magistral preparations combined with clobazam became eligible for reimbursement for Dravet syndrome and Lennox-Gastaut syndrome in patients aged 2 and over. — FAMHP (Federal Agency for Medicines and Health Products)
There is no whole-flower or THC-containing medical cannabis program in Belgium comparable to the Netherlands, Luxembourg or Germany.
No Belgium-specific published procedure for foreign patients bringing THC-containing medical cannabis into the country was found during this research. FAMHP publishes general guidance for travelers carrying narcotic and psychotropic medicines, which is the logical starting point for any patient planning to bring prescribed medication into Belgium. — FAMHP
Given that Belgium's own domestic program only permits CBD-only magistral preparations and Sativex, there is no confirmed legal pathway for a patient to bring THC-containing flower or oil into Belgium on a foreign prescription. Patients on THC-based medication should contact FAMHP directly well in advance of travel rather than assume a Schengen medical certificate alone will resolve the issue, since Belgium's underlying program does not accept THC products domestically.
Is 3 grams a legal limit in Belgium?
No. It is a prosecutorial threshold set by a 2005 directive, not a legal possession right. Cannabis remains illegal; police and prosecutors simply deprioritize small, first-time, non-aggravated cases.
Can I get a THC-based cannabis prescription filled in Belgium?
Only Sativex is broadly available as an authorized THC-containing medicine. Compounded (magistral) preparations are restricted to pure CBD.
Can I bring my foreign THC medical cannabis prescription into Belgium?
No confirmed legal pathway was found. Contact FAMHP directly before travel.
Is Belgium likely to legalize recreational cannabis soon?
Unlikely in the short term; the political divide between language communities and lack of consensus make near-term adult-use reform improbable, despite an active policy debate.