Metformin in Spain: Import Rules & Brands

Quick reference

Drug class: Biguanide antihyperglycaemic
Controlled substance: No — not a controlled or narcotic substance in Spain
Prescription required: Technically yes under Spanish law, though pharmacies in tourist areas sometimes dispense without one. Always carry documentation.
Available locally: Yes — sold as generic metformin and under the brand name Dianben at Spanish farmacias
Storage: Room temperature 20–25°C (68–77°F); protect from moisture and heat. No refrigeration required.
Max supply to carry: Up to 90-day personal supply permitted under Spanish Law 29/2006. Beyond 3 months requires AEMPS authorisation.
Key document: Doctor's letter or prescription confirming your name, medication name (INN: metformin), dose, frequency, and duration of treatment
Emergency alternative: Go to the nearest farmacia with your original packaging and doctor's letter; a Spanish doctor can issue a local prescription valid at any pharmacy in Spain.

Taking Metformin to Spain

Spain is one of the more straightforward destinations for travelling with metformin. The medication is not a controlled substance, requires no import permit, and is sold in Spanish pharmacies under both the generic name and the brand name Dianben. Your main tasks before travel are assembling the right documentation and ensuring you carry enough supply, since Spanish pharmacies cannot dispense on a foreign prescription alone without a locally issued authorisation. Spanish law permits travellers to carry up to three months of personal medication.^[1]

Medical disclaimer: This guide is for informational purposes only and does not constitute medical advice. Always consult your prescribing doctor before travelling with medication, particularly regarding supply quantities, storage requirements, and import documentation.

Before you travel

Documentation for travelling to Spain with metformin

Spain's Tax Agency states that travellers must be able to prove their medication is for personal use, and that a prescription or medical report satisfies this requirement. A doctor's letter on clinic letterhead is the most reliable document to carry. While metformin is not a controlled substance and no import permit is required, Spanish customs can question any medication, so preparation protects you against delays.

Pre-travel metformin paperwork timeline

T-30 days
Confirm trip length and supply. Metformin is unrestricted in Spain and EU citizens with an EHIC/GHIC can use their home prescription at Spanish pharmacies.
T-14 days
Non-EU travellers: ask your prescriber for a letter naming metformin (INN), brand, dose, and trip-length total. A Spanish translation is helpful at pharmacies but not legally required for personal-use supply.
T-7 days
If you'll need a local refill, identify a pharmacy near your accommodation. Spanish farmacias are dense and most stock metformin without ordering.
T-1 day
Pack metformin in original pharmacy-labelled packaging in carry-on with your prescriber letter.
T-0 (border)
No customs declaration is needed for personal-use metformin. Schengen/EU citizens can carry up to 90 days' supply unchallenged; non-EU travellers should match the supply to trip length.

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What your doctor's letter must include

Full name matching your passport. Medication name in both INN (metformin) and local brand (e.g. Glucophage or Dianben). Dose and frequency. Quantity being carried. Diagnosis (diabetes). Doctor's signature, registration number, and clinic letterhead. A Spanish translation is not legally required but is recommended for ease at customs and with local pharmacists.

EU travellers carrying a prescription from another EU member state can use it across Spain, as EU cross-border prescriptions are mutually recognised. Travellers from outside the EU should have their home prescription accompanied by the doctor's letter; a Spanish doctor can then issue a local prescription from that documentation. No notarisation or apostille is required for personal medication documentation under Spanish law.^[2]

How much metformin to bring

Spanish law permits a personal supply of up to 90 days without any special authorisation from the Agencia Española de Medicamentos y Productos Sanitarios (AEMPS). Carry 10–20% more than your planned trip requires to cover delays, missed doses, or a longer stay. If you are travelling for more than three months, contact AEMPS before departure to obtain the relevant import authorisation. Do not mail medication to Spain; Spanish customs will intercept and return mailed medicines regardless of origin.^[1]

Split your supply

Carry your main supply in hand luggage and a backup in your checked bag. If one bag is lost or delayed, you still have medication. Keep both portions in original packaging with the pharmacy label visible showing your name and dose.

Packing and storing metformin for travel

Metformin does not require refrigeration. The standard storage instruction is 20–25°C (68–77°F), with short excursions tolerated up to 30°C (86°F) during transit. Keep tablets in a tightly closed, moisture-resistant container away from direct sunlight. Spain's summer temperatures frequently exceed 35°C in cities such as Seville and Madrid; avoid leaving your medication in a hot car, direct sunlight, or an unventilated bag on the beach. A small insulated pouch is sufficient protection during day trips. Store at controlled room temperature per prescribing information.

At the airport and border

Airport security with metformin

Metformin tablets pass through airport security with no special procedures. They are not injectable, do not require liquid exemption, and are not flagged by X-ray scanners. Keep your medication in your carry-on bag rather than checked luggage so it is accessible throughout your journey. You do not need to declare metformin proactively at security checkpoints, but have your doctor's letter or prescription ready in case an officer asks. Original packaging with the pharmacy label is the fastest way to resolve any question at the security lane.

Customs and medication import rules for Spain

Under Article 74 of Spanish Law 29/2006, medication accompanying a traveller for personal treatment is exempt from standard import protocols, provided the quantity does not exceed a 90-day supply. You must be able to prove the medication is for your own use, and a prescription or medical report fulfils that requirement. Metformin is not a narcotic or psychotropic substance, so no AEMPS import authorisation is required.. If you carry more than 90 days' worth, you may be required to apply for a licence from AEMPS.

Keep your original packaging

Metformin is not a controlled substance in Spain and requires no import permit. However, carrying tablets in original manufacturer packaging with the pharmacy label showing your name is the single most effective way to prevent any customs delay. Decanting tablets into a pill organiser is not recommended for the journey through customs, though it is fine once you have arrived.

While in country

Metformin availability in Spain

Metformin brands available in Spain

Brand	Manufacturer	Formulation	Approved indication	Supply
Dianben	Merck S.L.	Immediate-release tablet (850 mg, 1000 mg)	Type 2 diabetes	Spain's most-recognised metformin brand; reliably stocked
Metformina EFG	Multiple — Cinfa, Stada, Sandoz, Normon	Immediate-release tablet (500 mg, 850 mg, 1000 mg)	Type 2 diabetes	Default dispensing; cheapest option under the SNS
Glucophage	Merck	Immediate-release tablet (500 mg, 850 mg, 1000 mg)	Type 2 diabetes	Globally familiar brand; available but less dispensed than Dianben
Glucophage XR (extended-release)	Merck	Extended-release tablet	Type 2 diabetes — once-daily option	Available in larger urban pharmacies; smaller farmacias may need to order

Spain has switched heavily to generic metformin under the EFG (Especialidad Farmacéutica Genérica) system. Branded options remain available but generics dominate prescriptions.

Metformin is widely available at Spanish farmacias under the generic name metformina and under the brand name Dianben. Farmacias are easy to identify by the green illuminated cross outside. Technically a prescription is required to dispense metformin, but pharmacies in tourist-heavy areas frequently dispense it on presentation of original packaging and a doctor's letter. Generic metformin costs roughly €2–€5 (~$2–$6 / per pack) for a standard monthly supply when purchased without insurance. If your home prescription is from another EU country, it is valid at Spanish pharmacies under EU cross-border rules. Metformin is a straightforward medication to prescribe in Spain.^[3]

Finding a doctor who can prescribe metformin in Spain

If you need a local prescription, a private GP consultation in Spain costs approximately €80–€150 (~$87–$163) in person, or as little as €30–€39 (~$33–$42) through telehealth platforms that operate across Spain. Metformin is considered a straightforward chronic medication; most Spanish doctors will issue a local prescription promptly once you present your existing documentation. English-speaking doctors are available in all major cities and coastal tourist areas. EU travellers holding a valid European Health Insurance Card (EHIC) or Global Health Insurance Card (GHIC) can access public healthcare through the Spanish Sistema Nacional de Salud, though waiting times at public centres (centros de salud) are typically longer than at private clinics.^[4]

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Storing metformin while in Spain

Metformin does not require refrigeration and is stable at room temperature. The ideal storage range is 20–25°C (68–77°F), with brief excursions up to 30°C (86°F) acceptable during transport. In summer, Spain's interior cities regularly exceed 35°C and the coast can reach high 30s; store your tablets in the coolest part of your accommodation, such as an air-conditioned bedroom drawer, rather than a bathroom or car. Keep the container tightly closed and away from humidity. If a tablet appears discoloured, cracked, or has an unusual odour, do not take it and replace at a local farmacia. Store in a tightly closed container at controlled room temperature.

Emergencies

What to do if something goes wrong with your metformin in Spain

If your medication is lost, stolen, or damaged, go directly to the nearest farmacia with your original packaging, doctor's letter, or prescription photograph on your phone. Spanish pharmacists are highly trained and, in tourist areas, many speak English. If the pharmacist cannot dispense without a local prescription, ask them to refer you to a nearby private clinic, or book a telehealth consultation which can issue a Spanish prescription valid at any farmacia on the same day.

If you run out unexpectedly, the fastest pathway is a private GP consultation followed by a Spanish prescription. Generic metformin is inexpensive: expect to pay approximately €2–€5 (~$2–$6) per pack at a farmacia without insurance. In an urgent situation, present yourself to urgencias (urgent care) at the nearest hospital with your original packaging. The emergency number for medical assistance in Spain is 112, available 24 hours a day.^[2]

Key phrases in Spanish

Necesito metformina. (I need metformin.) Tengo diabetes. (I have diabetes.) Por favor, llame a un médico. (Please call a doctor.) ¿Dónde está la farmacia más cercana? (Where is the nearest pharmacy?)

Call 112 for any medical emergency in Spain; operators are available 24 hours and typically speak Spanish and English. For urgent but non-life-threatening situations, the dedicated medical emergency line is 061. EU and GHIC cardholders can access public hospital urgencias at reduced or no cost.

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Frequently asked questions

Can I bring metformin into Spain?

Yes. Under Spanish Law 29/2006 (Article 74), travellers may carry personal medication for ongoing treatment without an import permit. You may bring up to a 90-day supply provided you carry a valid prescription or doctor's letter as proof of personal use. Metformin is not a controlled substance in Spain, so no import authorisation from AEMPS is required.^[1]

Is metformin available in Spanish pharmacies?

Yes. Metformin is widely available at Spanish farmacias under the generic name metformina and the brand name Dianben. A Spanish prescription is technically required, but in tourist areas pharmacists may dispense on presentation of original packaging and a doctor's letter. Generic packs cost approximately €2–€5 (~$2–$6).

Do I need a doctor's letter to fly with metformin?

A doctor's letter is not a legal requirement for airport security with metformin, as it is a non-controlled oral tablet. However, it is strongly recommended: it satisfies Spanish customs requirements, helps pharmacists dispense a replacement supply, and allows a Spanish doctor to issue a local prescription quickly if needed.

What if I run out of metformin in Spain?

Go to the nearest farmacia with your original packaging and doctor's letter. If a prescription is needed, book a private GP consultation (approximately €80–€150 (~$87–$163) in person, or €30–€39 (~$33–$42) via telehealth) and the doctor can issue a Spanish prescription valid at any pharmacy in the country the same day.

Does metformin need to be kept cold when travelling in Spain?

No. Metformin does not require refrigeration. It should be stored at 20–25°C (68–77°F) in a tightly closed container away from moisture and direct sunlight as per standard prescribing guidance. In Spain's summer heat, keep tablets in an air-conditioned room rather than in a car or beach bag.

Can I use an EU prescription to refill metformin in Spain?

Yes. A prescription issued by a doctor in one EU member state is valid across all other EU member states under EU cross-border prescription rules, including Spain. Be aware that the medication may be sold under a different brand name; ask the pharmacist for the generic equivalent (metformina) if your brand is not stocked.^[3]

Metformin in Spain: Dianben, Generics and Pharmacy Access