Package Leaflet: Information for the Patient
Acetylsalicylic Acid Alter 100 mg Gastro-Resistant Tablets EFG
Read the package leaflet carefully before starting to take this medicine because it contains important information for you.
Contents of the package leaflet
This medicine contains acetylsalicylic acid, which at low doses belongs to a group of medicines called antiplatelet agents. Platelets are small blood cells that produce blood clotting and are involved in thrombosis. When a blood clot forms in an artery, it stops blood flow and cuts off oxygen supply. When this happens in the heart, it can cause a heart attack or angina; in the brain, it can cause a stroke.
Acetylsalicylic Acid Alter is taken to reduce the risk of thrombus formation and consequently prevent:
Acetylsalicylic Acid Alter is also used to prevent thrombus formation after certain types of heart surgery to widen or unblock blood vessels.
This medicine is not recommended for emergency cases. It can only be used as a preventive treatment.
Do not take Acetylsalicylic Acid Alter:
Warnings and precautions
Before starting treatment with Acetylsalicylic Acid Alter, inform your doctor:
You should consult a doctor immediately if your symptoms worsen or if you experience serious or unexpected side effects, e.g. unusual bleeding symptoms, severe skin reactions or any other sign of severe allergy (see section "Possible side effects").
Inform your doctor if you are planning to have surgery (even minor surgery, such as tooth extraction) as acetylsalicylic acid is an anticoagulant and may increase the risk of bleeding.
Acetylsalicylic acid may cause Reye's syndrome when given to children. Reye's syndrome is a very rare disease that affects the brain and liver and can be life-threatening. For this reason, Acetylsalicylic Acid Alter should not be given to children under 16 years of age, unless prescribed by a doctor.
You should be careful not to become dehydrated (you may feel thirsty and have a dry mouth) as taking acetylsalicylic acid at the same time may cause kidney function to deteriorate.
This medicine is not suitable for relieving pain or reducing fever.
If you are in any of the above situations, or if you are not sure, consult your doctor or pharmacist.
Consult your doctor or pharmacist before starting to take Acetylsalicylic Acid Alter 100 mg.
Taking Acetylsalicylic Acid Alter with other medicines
Inform your doctor or pharmacist that you are taking, have recently taken or might take any other medicines.
If taken together, metamizole (a substance to reduce pain and fever) may reduce the effect of acetylsalicylic acid on platelet aggregation (blood cells stick together and form a blood clot). Therefore, this combination should be used with caution in patients taking low doses of acetylsalicylic acid as a cardioprotector.
The effect of treatment may be influenced if acetylsalicylic acid is taken at the same time as other medicines used to:
Taking Acetylsalicylic Acid Alter with food and drinks
Drinking alcohol may possibly increase the risk of gastrointestinal bleeding and prolong bleeding time.
Pregnancy, breastfeeding and fertility
If you are pregnant or breastfeeding, think you may be pregnant or are planning to have a baby, ask your doctor or pharmacist for advice before taking this medicine.
Pregnant women should not take acetylsalicylic acid during pregnancy unless their doctor advises them to do so. You should not take Acetylsalicylic Acid Alter if you are in the last 3 months of pregnancy, unless your doctor advises you to do so and in that case the daily dose should not exceed 100 mg (see section "Do not take Acetylsalicylic Acid Alter"). Normal or high doses of this medicine during the last phase of pregnancy can cause serious complications in the mother or baby.
Breastfeeding women should not take acetylsalicylic acid unless their doctor advises them to do so.
Driving and using machines
Acetylsalicylic Acid Alter is unlikely to affect your ability to drive or use machines.
Always take this medicine exactly as your doctor or pharmacist has told you. If you are not sure, check with your doctor or pharmacist.
Adults
Prevention of heart attacks:
Prevention of strokes:
Prevention of cardiovascular problems in patients with stable or unstable angina (a type of chest pain):
Prevention of thrombus formation after certain types of heart surgery:
Elderly patients
Doses are the same as for adults. In general, acetylsalicylic acid should be used with caution in elderly patients who are more prone to adverse events. Treatment should be reviewed at regular intervals.
Children
Acetylsalicylic acid should not be given to children and adolescents under 16 years of age, unless prescribed by a doctor (see section "Special warnings and precautions for use").
Method of administration
Oral use.
The tablets should be swallowed whole with a sufficient amount of liquid (half a glass of water). The tablets have a gastro-resistant coating that prevents irritating effects on the intestine, and therefore should not be crushed, broken or chewed.
If you take more Acetylsalicylic Acid Alter than you should
If you (or someone else) have taken too many tablets, contact your doctor immediately, contact the nearest emergency department or call the Toxicology Information Service, telephone 91 562 04 20, indicating the medicine and the amount taken.
Show your doctor the medicine or the empty package.
Symptoms of overdose may include ringing in the ears, hearing problems, headache, dizziness, confusion, nausea, vomiting and abdominal pain. A large overdose can lead to faster than normal breathing (hyperventilation), fever, excessive sweating, restlessness, convulsions, hallucinations, low blood sugar, coma and shock.
If you forget to take Acetylsalicylic Acid Alter
If you forget to take a dose, wait until it is time to take the next dose and continue treatment as usual.
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.
Like all medicines, this medicine can cause side effects, although not everybody gets them.
If you notice any of the following serious side effects, stop taking Acetylsalicylic Acid Alter and contact your doctor immediately:
Common side effects (may affect up to 1 in 10 people):
Uncommon side effects (may affect up to 1 in 100 people):
Rare side effects (may affect up to 1 in 1,000 people):
Side effects of unknown frequency:
Reporting of side effects
If you experience any side effects, talk to your doctor or pharmacist. This includes any possible side effects not listed in this package leaflet. You can also report side effects directly to the Spanish Medicines and Healthcare Products Agency (AEMPS) via the website: https://www.notificaram.es. By reporting side effects, you can help provide more information on the safety of this medicine.
Keep this medicine out of the sight and reach of children.
Do not store above 30°C. Do not refrigerate. Keep in the original package.
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. Ask your pharmacist how to dispose of medicines no longer required. These measures will help protect the environment.
Composition of Acetylsalicylic Acid Alter
Appearance of the product and package contents
Acetylsalicylic Acid Alter 100 mg tablets are round, biconvex and white. They are coated with a gastro-resistant coating that makes acetylsalicylic acid not released immediately in the stomach, but delayed in the duodenum. They are available in packs of 30 tablets in PVC-Al blisters.
Marketing authorisation holder and manufacturer
Marketing authorisation holder:
Laboratorios Alter, S.A.
C/ Mateo Inurria 30
28036 Madrid, Spain
Manufacturer
TOLL MANUFACTURING SERVICES S.L.
c/ Aragoneses 2-
28108 – Alcobendas – Madrid, Spain
or
FARMALIDER S.A.
c/ Aragoneses 2
28108 – Alcobendas – Madrid, Spain
or
Laboratorios Medicamentos Internacionales, S.A.
C/ Solana 26
28850 Torrejón de Ardoz, Madrid
Date of last revision of this package leaflet: June 2018
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/
The average price of Acetylsalicylic Acid ALTER 100 mg Gastro-Resistant Tablets in October, 2025 is around 1.45 EUR. Prices may vary depending on the region, pharmacy, and whether a prescription is required. Always check with a local pharmacy or online source for the most accurate information.