Laxatives in Spain: Types and Which One to Choose
Medically Reviewed by Dr. Pedro Yelamo Vera, MD
Licensed Physician No. 484814280 · Official Medical College of Bizkaia (Spain)Last reviewed: 31 October 2026
Laxatives in Spain: how fibre, osmotic, stimulant and softener laxatives differ, which to try first, which need a prescription and when to see a doctor.
You don't have to figure this out alone
Dr. Pedro Yelamo Vera is an independent, bilingual GP licensed in Spain. Book a 15-minute video consultation in English or Spanish for €50, with a private electronic prescription issued under Spanish law when clinically appropriate.
Laxatives in Spain come in four main types: bulk-forming fibre, osmotic, stimulant and softeners, plus suppositories and mini enemas. For most adults, more fibre, fluids and activity come first. If that fails, a pharmacist usually suggests fibre first. Some work in hours, others take days. Movicol (macrogol) and lactulose need a prescription here.
- Try diet and lifestyle changes first. Then a bulk-forming fibre laxative is the usual first choice, says the NHS.
- Osmotic laxatives draw water into the bowel. Stimulants make the bowel muscles push. Softeners make stools slippery.
- Stimulants work in about 6 to 12 hours. Fibre takes up to 3 days, and osmotic laxatives 2 to 3 days.
- In Spain, fibre, senna, bisacodyl, lactitol, glycerin suppositories and Micralax are sold without a prescription. Movicol and almost all other macrogol packs, and lactulose (Duphalac), need one.
- Children should only take a laxative a doctor recommends.
Dr. Pedro Yelamo Vera is a GP licensed in Spain (Colegiado No. 484814280).
For a medical emergency, call 112 or go to the nearest local emergency department. Do not wait for a video consultation or an online reply.
What are the main types of laxatives?
Each type works in a different way. The NHS groups them like this:
| Type | How it works | Time to work (NHS) | Examples in Spain |
|---|---|---|---|
| Bulk-forming | Adds fibre, so stools get bigger and softer | Up to 3 days | Ispaghula, sold as Plantago ovata (Plantaben) |
| Osmotic | Draws water into the bowel | 2 to 3 days | Macrogol (Movicol), lactulose (Duphalac), lactitol (Emportal) |
| Stimulant | Makes the bowel muscles push | 6 to 12 hours | Senna, bisacodyl and sodium picosulfate (Dulcolax) |
| Softener | Lets water and fat into stools, so they slide | 12 hours to 3 days | Docusate; liquid paraffin (parafina) is a lubricant |
There are also rectal options. A glycerin suppository (supositorio de glicerina) or a mini enema (microenema, such as Micralax) acts low in the bowel. They suit stool that is stuck near the exit.
Which laxative should I take first?
Start without medicine. The NHS advises more fibre, more fluids, regular toilet time and daily activity. Resting your feet on a low stool on the toilet can help too.
If that is not enough, the NHS says it is usually best to try a bulk-forming laxative first. The MSD Manual calls fibre one of the safest, gentlest ways to stay regular. It can cause wind and bloating at first. Drink plenty of water with it.
A pharmacist can then suggest an osmotic or a stimulant laxative if fibre does not help. In Spain the farmacéutico is used to these questions, so just ask.
Which laxatives need a prescription in Spain?
It depends on the product, not the type. The AEMPS medicines database, CIMA, lists these as sin receta (no prescription):
- Plantaben (Plantago ovata fibre).
- Emportal (lactitol, an osmotic powder).
- Dulcolax tablets, suppositories and picosulfate drops.
- Senna tablets such as Laxante Salud and Modane.
- Emuliquen Laxante (liquid paraffin with picosulfate).
- Glycerin suppositories, in adult, child and infant versions.
- Micralax mini enemas.
Two common osmotic laxatives are different. Every Movicol pack, and almost every other macrogol pack, needs a prescription in Spain. CIMA lists one macrogol powder, Femlax, as sold without a prescription. So does Duphalac and generic lactulose. This surprises many people from the UK, where some macrogol packs are sold in pharmacies, and the US, where MiraLAX is on the shelf.
Constipated for more than a few days, or not sure which laxative suits you?
You can book a video visit with a GP licensed in Spain, in English or Spanish. He checks for warning signs and explains which type fits your situation.
How long can I use a laxative?
For laxatives you buy yourself, the NHS says to stop when things improve. Do not use them for more than 7 days without advice. If a laxative has not helped after 3 days, speak to a doctor or pharmacist.
Stimulants are for short spells. The MSD Manual warns that long use can make the bowel rely on them. Overuse can also cause dehydration, low potassium and, rarely, a blocked bowel (NHS). Some people with long-term constipation need a laxative for months. That should be planned with a doctor.
Who should check before taking a laxative?
The NHS advises a word with a pharmacist or doctor first if you:
- Are pregnant or breastfeeding.
- Have heart failure or another heart problem.
- Have Crohn's disease or ulcerative colitis.
- Have trouble swallowing.
- Have lactose intolerance. Some laxatives contain lactose.
- Take opioid painkillers such as codeine or morphine.
The MSD Manual adds two cautions. Magnesium and phosphate laxatives can harm people with kidney disease and older adults. Liquid paraffin can, rarely, get into the lungs and inflame them.
Can children take laxatives?
Yes, but only if a doctor recommends one, says the NHS. Not every laxative suits children, as the Spanish Paediatric Association (AEP) points out. Infant glycerin suppositories are sold without a prescription. Still, ask the paediatrician before you use one. A regular toilet routine after meals, without rush, also helps. See a doctor soon if your child also vomits, has a swollen tummy or blood in the stool, or is not growing well.
When is constipation a reason to see a doctor?
See a doctor if you have:
- Blood in your stool, or black stool.
- Weight loss without trying.
- Ongoing tummy pain or bloating.
- A sudden change in your bowel habit, especially after 50.
- Constipation that keeps coming back, or no help from laxatives.
- Constipation that started with a new medicine.
Leaking watery stool after days of constipation can mean hard stool is stuck (faecal impaction). The MSD Manual says this needs a doctor, not more laxatives.
Go to urgencias or call 112 if you have severe tummy pain with a swollen belly and vomiting, and cannot pass wind or stool. Also go if you pass a lot of blood.
Talking it through with a doctor by video
Dr. Yelamo is a GP licensed in Spain. He sees adults, children and pregnant patients by video, every day from 07:30 to 20:30 (Spain time). In the visit he will:
- Ask how long it has lasted, what your stools are like and which medicines you take.
- Check for warning signs that need tests or an in-person exam.
- Explain which type of laxative, or which change in habits, fits you or your child.
- Tell you how to stop safely once things are back to normal.
He does not promise any test or prescription before the visit. Where clinically appropriate, following a genuine evaluation. Treatment and prescriptions are issued solely at the doctor's discretion based on evidence-based clinical guidelines.
A prescription is never guaranteed: it is issued only where clinically appropriate after a genuine evaluation, as a private electronic prescription under Spanish law. This service is for urgent, non-emergency care. In an emergency, call 112.
See how the Urgent Care video visit works. It lasts 15 minutes and costs €50.
This guide is general information. It does not replace the package leaflet or the advice of your doctor or pharmacist.
Frequently asked questions
What is the gentlest laxative?
Bulk-forming fibre, such as ispaghula (Plantago ovata), is one of the gentlest and safest. It works slowly, over up to 3 days. Drink plenty of water with it.
Which laxative works fastest?
Stimulant laxatives, such as senna or bisacodyl, usually work in 6 to 12 hours. Suppositories and mini enemas act low in the bowel and are also quick. They are for short-term use.
Can I buy laxatives without a prescription in Spain?
Yes, many. Fibre, senna, bisacodyl, lactitol, glycerin suppositories and Micralax are sold without a prescription. Movicol and almost all other macrogol packs, and lactulose (Duphalac), need one.
What is MiraLAX called in Spain?
MiraLAX is macrogol. In Spain macrogol is sold as Movicol and other brands. Almost all need a prescription; CIMA lists Femlax as the one sold without.
Is it bad to take laxatives every day?
Not always. Some people need them long term, with a doctor's plan. Daily stimulant laxatives without advice are not a good idea, as the bowel can come to rely on them.
Can I take a laxative when pregnant?
Check with your doctor, midwife or pharmacist first. Constipation is common in pregnancy, and more fibre, fluids and activity are safe first steps.
Sources
- NHS: Laxatives
- NHS: Constipation
- MSD Manual: Constipation in adults
- AEMPS CIMA: Dulcolax prescription status
- En Familia (AEP): Constipation in young children (in Spanish)
Related guides
Medical Citations & Sources
This content is written and reviewed by a licensed physician with reference to the following official health authorities.
