How to use CALTHEK 650 mg TABLETS
Contents of the leaflet
- Introduction
- What is Calthek and what is it used for
- What you need to know before you start taking
- How to take Calthek
- Possible side effects
- Storage of Calthek
- Contents of the pack and further information
Introduction
PACKAGE LEAFLET: INFORMATION FOR THE USER
Calthek 650 mg tablets
paracetamol
Read all of this leaflet carefully before you start taking this medicine because it contains important information for you.
Follow exactly the administration instructions of the medicine contained in this leaflet or as indicated by your doctor or pharmacist.
- Keep this leaflet, as you may need to read it again.
- If you need advice or more information, consult your pharmacist. If you experience side effects, consult your doctor or pharmacist, even if it is a side effect not listed in this leaflet. See section 4.
- You should consult a doctor if it worsens or does not improve after 3 days with fever or 5 days with pain.
Contents of the package leaflet:
- What is Calthek and what is it used for
- What you need to know before you start taking Calthek
- How to take Calthek
- Possible side effects
- Storage of Calthek
- Contents of the pack and further information
1. What is Calthek and what is it used for
Paracetamol is effective in reducing pain and fever.
This medicine is used for the symptomatic relief of occasional mild or moderate pain, such as headache, dental, muscle (cramps) or back (lumbago) pain and in febrile conditions in adults and adolescents over 15 years of age.
Not sure if this medicine is right for you?
Discuss your symptoms and treatment with a doctor online.
2. What you need to know before you start taking
Do not take Calthek
- If you are allergic to paracetamol or any of the other components of this medicine (listed in section 6).
Warnings and precautions
Do not take more than the recommended dose in section 3. How to take Calthek.
Avoid simultaneous use of this medicine with other medicines that contain paracetamol, such as flu and cold medicines, as high doses can lead to liver damage. Do not use more than one medicine that contains paracetamol without consulting your doctor.
If you have liver, kidney, heart, or lung disease, or have anemia (decrease in hemoglobin levels in the blood, due to or not due to a decrease in red blood cells), you should consult your doctor before taking this medicine.
When you are being treated with any medicine for epilepsy, you should consult your doctor before taking this medicine, as the efficacy of paracetamol may be decreased and hepatotoxicity may be increased, especially with high doses of paracetamol.
In chronic alcoholics, you should be cautious not to take more than 3 tablets of 650 mg of paracetamol in 24 hours.
Asthmatic patients sensitive to acetylsalicylic acid should consult their doctor before taking this medicine.
If the pain persists for more than 5 days, the fever for more than 3 days, or the pain or fever worsens or other symptoms appear, you should consult your doctor and reassess the clinical situation.
During treatment with Calthek, inform your doctor immediately:
If you have severe diseases, such as severe renal failure or sepsis (when bacteria and their toxins circulate in the blood, causing damage to organs), or if you have malnutrition, chronic alcoholism, or are also taking flucloxacillin (an antibiotic). A serious disease called metabolic acidosis (an anomaly in blood and fluids) has been reported in patients in these situations when paracetamol is used at regular doses for a prolonged period or when paracetamol is taken with flucloxacillin. The symptoms of metabolic acidosis may include: severe breathing difficulties with deep and rapid breathing, drowsiness, feeling of discomfort (nausea) and vomiting.
Interaction of Calthek with other medicines
Tell your doctor or pharmacist that you are taking, have recently taken, or may take any other medicine.
Paracetamol may interact with the following medicines:
- Medicine to prevent blood clots: Oral anticoagulants (acenocoumarol, warfarin)
- Medicines for treating epilepsy: Antiepileptics (lamotrigine, phenytoin or other hydantoins, phenobarbital, methylphenobarbital, primidone, carbamazepine)
- Medicines for treating tuberculosis: (isoniazid, rifampicin)
- Medicines for treating depression and convulsions: Barbiturics (used as hypnotics, sedatives, and anticonvulsants)
- Medicines to lower cholesterol levels in blood: (cholestyramine)
- Medicines used to increase urine elimination (loop diuretics such as furosemide)
- Medicines used for the treatment of gout (probenecid and sulfinpyrazone)
- Medicines used to prevent nausea and vomiting: Metoclopramide and domperidone
- Medicines used for the treatment of high blood pressure and heart rhythm disorders (arrhythmias): Propranolol.
Do not use with other analgesics (pain-relieving medicines) without consulting your doctor.
Tell your doctor or pharmacist if you are taking:
Flucloxacillin (antibiotic), due to a serious risk of blood and fluid anomaly (called metabolic acidosis) that requires urgent treatment (see section 2).
As a general rule for any medicine, it is recommended to systematically inform your doctor or pharmacist if you are being treated with another medicine. In the case of treatment with oral anticoagulants, it can be administered occasionally as the analgesic of choice.
Interference with analytical tests:
If you are going to have any analytical test (including blood tests, urine tests, skin tests that use allergens, etc.), tell your doctor that you are taking this medicine, as it may alter the results of these tests.
Calthek with food and drinks:
The use of paracetamol in patients who habitually consume alcohol (three or more alcoholic beverages per day: beer, wine, liquor...) may cause liver damage. |
Taking this medicine with food does not affect its efficacy.
Use in children and adolescents:
Do not use in children or adolescents under 15 years of age.
Pregnancy and breastfeeding
If you are pregnant or breastfeeding, or think you may be pregnant or are planning to become pregnant, consult your doctor or pharmacist before using this medicine.
In case of need, paracetamol can be used during pregnancy. You should use the lowest possible dose that reduces pain or fever and use it for the shortest possible time. Contact your doctor if the pain or fever does not decrease or if you need to take the medicine more frequently.
Small amounts of paracetamol may appear in breast milk, therefore, it is recommended that you consult your doctor or pharmacist before taking this medicine.
Driving and using machines
The influence of paracetamol on the ability to drive and use machines is nil or insignificant.
3. How to take Calthek
Follow exactly the administration instructions of this medicine contained in this leaflet or as indicated by your doctor or pharmacist. In case of doubt, ask your doctor or pharmacist.
This medicine should be taken orally.
According to your preferences, the tablets can be swallowed directly or broken in half, with the help of a glass of liquid, preferably water. The score line is only for breaking the tablet if you find it difficult to swallow it whole.
Always use the lowest effective dose.
Avoid using high daily doses of paracetamol for prolonged periods, as this increases the risk of adverse effects such as liver damage.
The administration of this medicine is subject to the appearance of pain or fever. As these disappear, treatment should be discontinued.
If the pain persists for more than 5 days, the fever for more than 3 days, or the pain or fever worsens or other symptoms appear, you should discontinue treatment and consult your doctor.
The recommended dose is:
Adults and adolescents over 15 years of age with a weight over 50 kg: take 1 tablet every 4 or 6 hours, as needed. Do not take more than 3 tablets in 24 hours, divided into 3 doses.
Patient with liver disease: before taking this medicine, they must consult their doctor. They should take the amount of medicine prescribed by their doctor with a minimum interval of 8 hours between each dose. Do not take more than 3 tablets in 24 hours, divided into 3 doses.
Patient with kidney disease: before taking this medicine, they must consult their doctor.
Patient with severe or moderate disease may take a maximum of 500 mg of paracetamol per dose. Due to the paracetamol content, this medicine should not be used in these patients.
Elderly patients: should consult their doctor.
Use in children and adolescents:
Do not use in children (under 12 years) or adolescents with a body weight <50kg, as there are other formulations that allow for appropriate dosing for this group of patients.
If you think the action of this medicine is too strong or too weak, tell your doctor or pharmacist.
If you take more Calthek than you should:
You should consult your doctor or pharmacist immediately. In case of overdose or accidental ingestion, go immediately to a medical center or call the Toxicology Information Service (telephone 91 562 04 20), indicating the medicine and the amount taken.
If you have ingested an overdose, you should go immediately to a medical center, even if you do not notice symptoms, as they often do not appear until 3 days after ingestion, even in cases of severe poisoning.
The symptoms of overdose may be: dizziness, vomiting, loss of appetite, yellowing of the skin and eyes (jaundice), and abdominal pain.
Treatment of overdose is more effective if started within 4 hours of ingestion of the medicine.
Patient treated with barbiturics or chronic alcoholics may be more susceptible to the toxicity of a paracetamol overdose.
If you forget to take Calthek:
Do not take a double dose to make up for forgotten doses, simply take the forgotten dose when you remember, taking the next doses with the indicated interval between doses (at least 4 hours).
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.
Rare side effects that may occur (up to 1 in 1,000 people) are: discomfort, low blood pressure (hypotension), and increased levels of transaminases in the blood.
Very rare side effects that may occur (up to 1 in 10,000 people) are:
Kidney disease, cloudy urine, allergic dermatitis (skin rash), jaundice (yellowing of the skin), blood disorders (agranulocytosis, leucopenia, neutropenia, hemolytic anemia), and low blood sugar (hypoglycemia).
Very rare cases of severe skin reactions have been reported.
Frequency not known (cannot be estimated from the available data):
A serious disease that can make the blood more acidic (called metabolic acidosis) in patients with severe disease using paracetamol (see section 2).
Paracetamol may damage the liver when taken in high doses or for prolonged treatments.
Reporting of side effects:
If you experience any side effect, consult your doctor or pharmacist, even if it is a possible side effect not listed in this leaflet. You can also report them directly through the Spanish Pharmacovigilance System for Human Use Medicines: https://www.notificaram.es. By reporting side effects, you can help provide more information on the safety of this medicine.
5. Storage of Calthek
This medicine does not require special storage conditions.
Keep this medicine out of the sight and reach of children.
Do not use this medicine after the expiry date stated on the packaging. The expiry date is the last day of the month indicated.
“Medicines should not be disposed of via wastewater or household waste. Dispose of the packaging and any unused medicine in the SIGRE point of the pharmacy. 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 Calthek
The active ingredient is paracetamol. Each tablet contains 650 mg of paracetamol.
The other ingredients are: pregelatinized corn starch, stearic acid, povidone, crospovidone, microcrystalline cellulose, and vegetable magnesium stearate.
Appearance of Calthek and pack contents
White, oblong, scored tablets, packaged in PVC/PVDC-Aluminum blisters.
This medicine is available in packs of 20 tablets.
Marketing authorization holder
Apotheke Laboratorios, S.L.
Paseo de la Castellana 40, 8th floor
28046 - 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
Date of the last revision of this leaflet:March 2025
“Detailed and updated information on this medicine is available on the website of the Spanish Agency for Medicines and Health Products (AEMPS) http://www.aemps.gob.es/”
Illustrative image - Country of registration
- Dosage formTABLET, 650 mg tablets
- ATC codeN02BE01
- Active substance
- Prescription requiredNo
- Manufacturer
- This information is for reference only and does not constitute medical advice. Always consult a doctor before taking any medication. Oladoctor is not responsible for medical decisions based on this content.
- Alternatives to CALTHEK 650 mg TABLETS
ABEZEN 1 G FILM-COATED TABLETSIllustrative imageDosage form: TABLET, 1 gActive substance: paracetamolManufacturer: Uxa Farma S.A.Prescription required
ANTIDOL 1 G FILM-COATED TABLETSIllustrative imageDosage form: TABLET, 1 gActive substance: paracetamolManufacturer: Laboratorios Cinfa S.A.Prescription not required
ANTIDOL 1 G TABLETSIllustrative imageDosage form: TABLET, 1 gActive substance: paracetamolManufacturer: Laboratorios Cinfa S.A.Prescription not required
Online doctors for CALTHEK 650 mg TABLETS
Discuss questions about CALTHEK 650 mg TABLETS, including use, safety considerations and whether a prescription is appropriate, subject to medical assessment and local regulations.
Frequently Asked Questions
CALTHEK 650 mg TABLETS does not require a prescription in Spain. You can check with a doctor online whether this medicine may be appropriate for your situation.
The active ingredient in CALTHEK 650 mg TABLETS is paracetamol. This information helps identify medicines with the same composition but different brand names.
CALTHEK 650 mg TABLETS is manufactured by Apotheke Laboratorios S.L.. Pharmacy brands and packaging may differ depending on the distributor.
Doctors such as Psychiatrists, Neurologists, General medicine doctors, Pain medicine doctors, Anaesthesiologists may assess whether CALTHEK 650 mg TABLETS is appropriate, depending on your situation and local regulations. You can book an online consultation to discuss your symptoms and possible next steps.
The prescription is issued by a doctor after assessing your health. In Spain, CALTHEK 650 mg TABLETS is then dispensed in pharmacies with that prescription. An online consultation does not guarantee that a prescription will be issued: the decision always rests with the doctor.
To request an assessment, you can use Oladoctor:
Other medicines with the same active substance (paracetamol) include ABEZEN 1 G FILM-COATED TABLETS, ANTIDOL 1 G FILM-COATED TABLETS, ANTIDOL 1 G 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.
