ASACOL 800 mg Gastro-Resistant Tablets

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Anna Biriukova

Gastroenterology6 years of experience

Dr Anna Biriukova is an internal medicine doctor with clinical experience in cardiology, endocrinology, and gastroenterology. She provides online consultations for adults, offering expert medical support for heart health, hormonal balance, digestive issues, and general internal medicine.

Cardiology – Diagnosis and treatment of:

  • High blood pressure, blood pressure fluctuations, and cardiovascular risk prevention.
  • Chest pain, shortness of breath, arrhythmias (tachycardia, bradycardia, palpitations).
  • Leg swelling, chronic fatigue, reduced exercise tolerance.
  • EKG interpretation, lipid profile evaluation, cardiovascular risk assessment (heart attack, stroke).
  • Post-COVID-19 cardiac monitoring and care.
Endocrinology – Diabetes, thyroid, metabolism:
  • Diagnosis and management of type 1 and type 2 diabetes, and prediabetes.
  • Individual treatment plans including oral medications and insulin therapy.
  • GLP-1 therapy– modern pharmacological treatment for weight management and diabetes control, including drug selection, monitoring, and safety follow-up.
  • Thyroid disorders – hypothyroidism, hyperthyroidism, autoimmune thyroid diseases (Hashimoto’s, Graves’ disease).
  • Metabolic syndrome – obesity, lipid disorders, insulin resistance.
Gastroenterology – Digestive health:
  • Abdominal pain, nausea, heartburn, gastroesophageal reflux (GERD).
  • Stomach and intestinal conditions: gastritis, irritable bowel syndrome (IBS), indigestion.
  • Management of chronic digestive disorders and interpretation of tests (endoscopy, ultrasound, labs).
General internal medicine and preventive care:
  • Respiratory infections – cough, colds, bronchitis.
  • Lab test analysis, therapy adjustments, medication management.
  • Adult vaccinations – planning, contraindications assessment.
  • Cancer prevention – screening strategies and risk assessment.
  • Holistic approach – symptom relief, complication prevention, and quality of life improvement.
Dr Biriukova combines internal medicine with specialist insight, offering clear explanations, personalised treatment plans, and comprehensive care tailored to each patient.
Book a video appointment
€66
This page is for general information. Consult a doctor for personal advice. Call emergency services if symptoms are severe.
About the medicine

How to use ASACOL 800 MG GASTRO-RESISTANT TABLETS

Contents of the leaflet

  1. Introduction
  2. What is Asacol and what is it used for
  3. Before you take Asacol
  4. How to take Asacol
  5. Possible side effects
  6. Storing Asacol
  7. Contents of the pack and further information

Introduction

Package Leaflet: Information for the User

Asacol 800 mg Gastro-Resistant Tablets

mesalazine

Read all of this leaflet carefully before you start taking this medicine because it contains important information for you.

  • Keep this leaflet. You may need to read it again.
  • If you have any further questions, ask your doctor or pharmacist.
  • This medicine has been prescribed for you only. Do not pass it on to others. It may harm them, even if their signs of illness are the same as yours.
  • If you get any side effects, talk to your doctor or pharmacist. This includes any possible side effects not listed in this leaflet. See section 4.

Contents of the pack:

1 What is Asacol and what is it used for

2 Before you take Asacol

3 How to take Asacol

4 Possible side effects

5 Storing Asacol

6 Contents of the pack and further information

1. What is Asacol and what is it used for

Asacol is indicated for:

  • Treatment of acute phase of mild to moderate ulcerative colitis.
  • Maintenance treatment of ulcerative colitis remission (including patients who do not tolerate sulfasalazine).
  • Maintenance treatment of Crohn's disease remission.
Doctor consultation

Not sure if this medicine is right for you?

Discuss your symptoms and treatment with a doctor online.

2. Before you take Asacol

Do not take Asacol

  • If you are allergic to mesalazine or any of the other ingredients of this medicine (listed in section 6).
  • If you are allergic to salicylates (e.g. aspirin).
  • If you have severe liver impairment.
  • If you have severe kidney impairment.

Warnings and precautions

Consult your doctor before taking Asacol, especially if you:

  • suffer from any lung disease, such as asthma.
  • have had an allergy to sulfasalazine in the past.
  • have ever had heart allergic reactions such as inflammation of the heart muscle or pericardium. If you have had previous suspicions of mesalazine-induced allergic reactions in the heart, then you should not take Asacol. Asacol can be used with caution if you have previously suffered a non-mesalazine-induced heart allergic reaction.
  • If you have a stomach or intestinal ulcer, you should take Asacol with caution.
  • If you have ever had a severe skin rash or skin peeling, blisters, or sores in the mouth after using mesalazine.

If you experience severe or recurrent headache, vision changes, or ringing or buzzing in the ears, contact your doctor immediately.

Kidney stones may occur with the use of mesalazine. Symptoms include pain in the sides of the abdomen and blood in the urine. Make sure to drink a sufficient amount of liquid during treatment with mesalazine.

Mesalazine may cause a discoloration of the urine to a reddish-brown color after contact with sodium hypochlorite bleach in the toilet water. This is a chemical reaction between mesalazine and bleach and is harmless.

Severe skin rashes, such as drug reaction with eosinophilia and systemic symptoms (DRESS), Stevens-Johnson syndrome (SSJ), and toxic epidermal necrolysis (TEN), have been observed with mesalazine treatment. Stop taking mesalazine and seek medical attention immediately if you observe any of the symptoms related to these severe skin rashes described in section 4.

Evaluation of your liver, kidney, and blood

Before and during the intake of Asacol, your doctor may want to evaluate you from time to time to check that your liver, kidneys, blood, and lungs are in good condition.

Tablets in the stool

There are some reports of intact tablets in the stool. What appears to be an intact tablet may sometimes be the remains of the tablet coating. If you frequently observe tablets or their coatings in the stool, you should consult your doctor.

Children and adolescents

The use of Asacol is only recommended in children from 6 years of age.

Elderly patients

Asacol should be used with caution, and the doctor will evaluate both renal and hepatic function before starting treatment.

Other medicines and Asacol

Tell your doctor or pharmacist if you are using or have recently used or might use any other medicines, such as:

  • Medicines to prevent blood clotting (anticoagulants, e.g. warfarin).
  • Medicines to reduce the activity of the immune system (e.g. azathioprine or 6-mercaptopurine or thioguanine).

Using Asacol with food, drinks, and alcohol

The consumption of food, drinks, and alcohol does not interfere with the use of Asacol.

Pregnancy and breastfeeding

If you are pregnant or breastfeeding, think you may be pregnant, or plan to become pregnant, consult your doctor or pharmacist before using this medicine.

There is limited experience with the use of mesalazine during pregnancy and breastfeeding.

Newborns may develop allergic reactions after breastfeeding, such as diarrhea. If the newborn presents with diarrhea, breastfeeding should be interrupted.

Driving and using machines

The influence of Asacol on the ability to drive and use machines is negligible or non-existent. However, if it affects you in any way, do not drive or use machines.

Asacol contains milk sugar (lactose)

This medicine contains lactose. If your doctor has told you that you have an intolerance to some sugars, consult them before taking this medicine.

3. How to take Asacol

Follow the administration instructions of this medicine exactly as indicated by your doctor. If in doubt, consult your doctor or pharmacist again.

Asacol should be taken orally.

The tablets should be swallowed whole and before meals.

The recommended dose is:

Adults

Ulcerative colitis, acute treatment of mild to moderate episodes: 2.4 g (3 tablets, divided into three doses per day).

Maintenance treatment of ulcerative colitis: 0.8 g (1 tablet) to 1.6 g (2 tablets in separate doses) per day.

Crohn's disease, maintenance treatment: individualized dose up to a maximum of 2.4 g per day (2 to 3 tablets distributed in several doses per day).

Elderly patients

The administration of Asacol in elderly patients should be done with caution and always limited to those patients with normal renal function.

Use in children

The efficacy and safety of Asacol in children under 5 years of age have not been established.

Information on the effect in children (between 6 and 18 years of age) is limited.

Children from 6 years of age

The general recommendation is that half the adult dose can be administered to children up to 40 kg in weight; and the normal adult dose to children over 40 kg. However, your doctor will indicate the appropriate dose to treat your disease.

If you take more Asacol than you should

In case of overdose or accidental ingestion, consult your doctor or pharmacist or go to the nearest hospital, or call the Toxicology Information Service. Telephone 91 562 04 20 (indicating the medicine and the amount ingested).

In case of massive ingestion of the tablets, treatment consists of gastric lavage, induction of vomiting, along with symptomatic and supportive measures. There is no specific antidote.

If you forget to take Asacol

If you have forgotten to take a dose, take it as soon as you remember, and then take the next dose at the usual time.

Do not take a double dose to make up for forgotten doses.

If you have any further questions on the use of this medicine, ask your doctor or pharmacist.

Medicine questions

Started taking the medicine and have questions?

Discuss your symptoms and treatment with a doctor online.

4. Possible side effects

Like all medicines, this medicine can cause side effects, although not everybody gets them.

Adverse reactions have been reported in specific organs affecting the heart, lungs, liver, kidneys, pancreas, skin, and subcutaneous tissue.

Stop taking Asacol immediately and consult a doctor urgently if you develop unexplained bruising (without injury), bleeding, purple spots, or spots under the skin, anemia (feeling tired, weak, or pale, especially in the lips, nails, and inside the eyelids), fever (high temperature), sore throat, or unusual bleeding (e.g. nosebleeds), reddish patches, or circular or coin-shaped patches on the chest, often with central blisters, skin peeling, mouth ulcers, throat ulcers, nose ulcers, genital ulcers, eye ulcers, generalized rash, fever, and swollen lymph nodes. These severe skin rashes are often preceded by fever or flu-like symptoms.

Tell your doctor immediatelyif you experience severe or recurrent headache, vision changes, or ringing or buzzing in the ears. These could be symptoms of increased pressure inside your skull (idiopathic intracranial hypertension) (frequency not known [cannot be estimated from the available data]).

The following adverse reactions have been reported in the approximate frequencies shown:

Common(may affect up to 1 in 10 patients)

  • Rash
  • Indigestion

Uncommon(may affect up to 1 in 100 patients)

  • Fever
  • High number of white blood cells, called eosinophils
  • Hives, itching of the skin
  • Chest pain

Rare(may affect up to 1 in 1,000 patients)

  • Headache
  • Feeling of tingling, pinching, and numbness
  • Dizziness
  • Heart inflammation with signs such as chest pain and palpitations
  • Diarrhea, nausea, stomach pain, flatulence, feeling of restlessness, and stomach discomfort, with nausea and vomiting.
  • Increased sensitivity of the skin to sunlight and ultraviolet light (photosensitivity)

Very rare(may affect up to 1 in 10,000 patients)

  • Severe reduction of blood cells that can cause weakness, bruising, increase the risk of infections, low white blood cell count, reduction of platelets which increases the risk of bleeding
  • Allergic reactions such as rash and skin eruptions
  • Fever that appears while taking the medicine and disappears when stopping it (drug fever)
  • Ulcerative colitis that can include the entire large intestine
  • Nerve damage or abnormal nerves causing numbness or tingling
  • Lung disease (scarring of lung tissue, allergic reaction), resulting in difficulty breathing or wheezing and fluid accumulation in the lungs, pneumonia
  • Pancreas inflammation (associated with pain in the upper abdomen and back and feeling of discomfort)
  • Abnormal liver function test results, hepatitis (inflammation of the liver leading to flu-like symptoms and jaundice)
  • Hair loss
  • Muscle pain (myalgia) or joint pain (arthralgia)
  • Kidney problems (such as inflammation and scarring of the kidney), kidney failure, which can be reversible if treatment is stopped early
  • Reversible reduction of sperm production
  • Cough

Frequency not known(cannot be estimated from the available data)

  • Autoimmune disease (lupus-like syndrome) that can cause inflammation of the pericardium or the membranes surrounding the lungs and heart, rash, and/or joint pain
  • Weight loss
  • Abnormal laboratory test results
  • Severe skin diseases (Erythema multiforme, Stevens-Johnson syndrome, and Toxic Epidermal Necrolysis)
  • Acute chest pain and dry cough (inflammation of the membrane covering the lungs)
  • Kidney stones and associated kidney pain (see also section 2)

Reporting of side effects

If you experience any side effects, talk to your doctor or pharmacist, even if it is possible side effects not listed in this leaflet. You can also report side effects directly through the Spanish Medicines and Healthcare Products Agency (AEMPS) website: www.notificaRAM.es. By reporting side effects, you can help provide more information on the safety of this medicine.

5. Storing Asacol

This medicine does not require any special storage conditions. Store in the original packaging.

Keep this medicine out of the sight and reach of children.

Do not use this medicine after the expiry date which is stated on the packaging after EXP. The expiry date is the last day of the month shown.

Medicines should not be disposed of via wastewater or household waste. Place the packaging and any unused medicine in the pharmacy's SIGRE collection point. If in doubt, ask your pharmacist how to dispose of the packaging and any unused medicine. This will help protect the environment.

6. Contents of the pack and further information

Composition of Asacol 800 mg Gastro-Resistant Tablets

  • The active ingredient is mesalazine. Each tablet contains 800 mg of mesalazine.
  • The other ingredients are lactose, potato starch, magnesium stearate, talc, povidone, methacrylic acid copolymer type B, triethyl citrate, yellow iron oxide (E172), red iron oxide (E172), and polyethylene glycol 6000.

Appearance of the product and pack contents

Reddish-brown, oblong, gastro-resistant tablets contained in PVC/aluminum blisters.

Available in packs of 60 or 90 gastro-resistant tablets.

Marketing authorization holder

TILLOTTS PHARMA SPAIN, S.L.U.

Travessera de Gràcia 58, 5º 3ª

08006 Barcelona

Spain

Manufacturer

HAUPT PHARMA WULFING GMBH

Bethelner Landstrasse, 18

Gronau D-31028

GERMANY

Date of last revision of this leaflet:May 2025

Detailed information on this medicine is available on the website of the Spanish Agency for Medicines and Healthcare Products (AEMPS) http://www.aemps.gob.es/

Online doctors for ASACOL 800 MG GASTRO-RESISTANT TABLETS

Discuss questions about ASACOL 800 MG GASTRO-RESISTANT TABLETS, including use, safety considerations and prescription review, subject to medical assessment and local regulations.

Doctor
5.0(11)

Anna Biriukova

Gastroenterology6 years of experience

Dr Anna Biriukova is an internal medicine doctor with clinical experience in cardiology, endocrinology, and gastroenterology. She provides online consultations for adults, offering expert medical support for heart health, hormonal balance, digestive issues, and general internal medicine.

Cardiology – Diagnosis and treatment of:

  • High blood pressure, blood pressure fluctuations, and cardiovascular risk prevention.
  • Chest pain, shortness of breath, arrhythmias (tachycardia, bradycardia, palpitations).
  • Leg swelling, chronic fatigue, reduced exercise tolerance.
  • EKG interpretation, lipid profile evaluation, cardiovascular risk assessment (heart attack, stroke).
  • Post-COVID-19 cardiac monitoring and care.
Endocrinology – Diabetes, thyroid, metabolism:
  • Diagnosis and management of type 1 and type 2 diabetes, and prediabetes.
  • Individual treatment plans including oral medications and insulin therapy.
  • GLP-1 therapy– modern pharmacological treatment for weight management and diabetes control, including drug selection, monitoring, and safety follow-up.
  • Thyroid disorders – hypothyroidism, hyperthyroidism, autoimmune thyroid diseases (Hashimoto’s, Graves’ disease).
  • Metabolic syndrome – obesity, lipid disorders, insulin resistance.
Gastroenterology – Digestive health:
  • Abdominal pain, nausea, heartburn, gastroesophageal reflux (GERD).
  • Stomach and intestinal conditions: gastritis, irritable bowel syndrome (IBS), indigestion.
  • Management of chronic digestive disorders and interpretation of tests (endoscopy, ultrasound, labs).
General internal medicine and preventive care:
  • Respiratory infections – cough, colds, bronchitis.
  • Lab test analysis, therapy adjustments, medication management.
  • Adult vaccinations – planning, contraindications assessment.
  • Cancer prevention – screening strategies and risk assessment.
  • Holistic approach – symptom relief, complication prevention, and quality of life improvement.
Dr Biriukova combines internal medicine with specialist insight, offering clear explanations, personalised treatment plans, and comprehensive care tailored to each patient.
Book a video appointment
€66
Doctor
5.0(36)

Andrei Popov

General medicinePain medicine7 years of experience

Dr. Andrei Popov is a family physician with specialized training in the management of chronic pain. He provides video consultations for adults in Spain and across Europe: whether you have been living with pain for months that no one has been able to properly explain, or you need to resolve a health issue without waiting weeks for an appointment.

His approach is clear: to listen, organize your case, and provide you with a practical roadmap based on evidence-based medicine and adapted to your medical history and personal needs.

Pain: how he can help

  • Chronic pain (more than 3 months
  • Migraine and recurrent or high-intensity headaches
  •  Neck, lower back, back and joint pain
  •  Post-traumatic pain after injuries or surgeries
  •  Pain of neurological origin: neuralgia, neuropathic pain, fibromyalgia

General medicine

  • Frequent respiratory infections (cold, flu, persistent cough)
  • Hypertension, diabetes and metabolic disorders
  • Review of laboratory tests and MRI/CT reports (explained in clear language)
  • Preventive medicine and health monitoring
  • Second opinions and treatment adjustments (when clinically appropriate)

What the consultation is like
 Each session lasts up to 30 minutes. We review symptoms, medical history, medications and any tests you provide, and you finish the consultation with a clear treatment plan, defined next steps, and criteria to understand when follow-up may be needed. If warning signs are detected, he will clearly advise whether you need in-person care or urgent medical attention.

Book a video appointment
€86
Doctor
5.0(19)

Nuno Tavares Lopes

Family medicineGeneral medicine18 years of experience

Dr. Nuno Tavares Lopes is a licensed physician in Portugal with 17 years of experience in emergency medicine, family and general practice, and public health. He is the Director of Medical and Public Health Services at an international healthcare network and serves as an external consultant for the WHO and ECDC.

  • Emergency care: infections, fever, chest/abdominal pain, minor injuries, paediatric emergencies
  • Family medicine: hypertension, diabetes, cholesterol, chronic disease management
  • Travel medicine: pre-travel advice, vaccinations, fit-to-fly certificates, travel-related illnesses
  • Sexual and reproductive health: PrEP, STD prevention, counselling, treatment
  • Weight management and wellness: personalised weight loss programmes, lifestyle guidance
  • Skin and ENT issues: acne, eczema, allergies, rashes, sore throat, sinusitis
  • Pain management: acute and chronic pain, post-surgical care
  • Public health: prevention, health screenings, long-term monitoring
  • Sick leave (Baixa médica) connected to Segurança Social in Portugal
  • IMT medical certificates for driving licence exchange
Dr. Nuno Tavares Lopes provides medical support for patients using GLP-1 medications (Mounjaro, Wegovy, Ozempic, Rybelsus) as part of a weight loss strategy. He offers individualised treatment planning, regular follow-up, dose adjustment, and advice on combining medication with sustainable lifestyle changes. Consultations follow the medical standards accepted in Europe.

Dr. Lopes also provides interpretation of medical tests, follow-up care for complex patients, and multilingual support. Whether for urgent concerns or long-term care, he helps patients act with clarity and confidence.

Book a video appointment
€70

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Frequently Asked Questions

Is a prescription required for ASACOL 800 MG GASTRO-RESISTANT TABLETS?

ASACOL 800 MG GASTRO-RESISTANT TABLETS requires a prescription in Spain. You can check with a doctor online whether this medicine may be appropriate for your situation.

What is the active substance in ASACOL 800 MG GASTRO-RESISTANT TABLETS?

The active ingredient in ASACOL 800 MG GASTRO-RESISTANT TABLETS is mesalazine. This information helps identify medicines with the same composition but different brand names.

How much does ASACOL 800 MG GASTRO-RESISTANT TABLETS cost in pharmacies?

The average pharmacy price for ASACOL 800 MG GASTRO-RESISTANT TABLETS is around 35.36 EUR. Prices may vary depending on the manufacturer and dosage form.

Who manufactures ASACOL 800 MG GASTRO-RESISTANT TABLETS?

ASACOL 800 MG GASTRO-RESISTANT TABLETS is manufactured by Tillotts Pharma Spain S.L.U.. Pharmacy brands and packaging may differ depending on the distributor.

Which doctors can assess the use of ASACOL 800 MG GASTRO-RESISTANT TABLETS online?

Doctors such as Family doctors, Psychiatrists, Dermatologists, Cardiologists, Endocrinologists, Gastroenterologists, Pulmonologists, Nephrologists, Rheumatologists, Hematologists, Infectious disease physicians, Allergists, Geriatricians, Paediatricians, Oncologists may assess whether ASACOL 800 MG GASTRO-RESISTANT TABLETS is appropriate, depending on your situation and local regulations. You can book an online consultation to discuss your symptoms and possible next steps.

How to buy ASACOL 800 MG GASTRO-RESISTANT TABLETS in Spain?

Spain has a well-developed healthcare infrastructure across major cities such as Madrid, Barcelona, Valencia, and Seville. Pharmacies are widely available and operate under strict regulations, ensuring access to prescribed medications.

You can buy ASACOL 800 MG GASTRO-RESISTANT TABLETS in Madrid, Barcelona, Seville, or Valencia at any local pharmacy with a valid prescription.

To obtain a prescription, you can use Oladoctor:

What are the alternatives to ASACOL 800 MG GASTRO-RESISTANT TABLETS?

Other medicines with the same active substance (mesalazine) include ASACOL 1 G SUPPOSITORIES, ASACOL 1600 mg GASTRO-RESISTANT TABLETS, ASACOL 400 mg GASTRO-RESISTANT TABLETS. These may have different brand names or formulations but contain the same therapeutic ingredient. Always consult a doctor before switching or starting a new medicine.

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