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Theox cr

Last updated on November 21st, 2021

Generic name: Theophylline

Brand names: Theox Cr

General Information:

Theox Cr is prescribed to treat rhythm disturbance of the heart, supraventricular tachycardia as well as to control heart rate response to other rhythm disturbances, specifically, atrial fibrillation and flutter. It may also be used for treatment of the acute attack or for chronic long-term treatment. The enteric-coated and extended-release dosage forms are usually used only for chronic treatment.

Your doctor may prescribe this remedy for other purposes. Contact your physician if you need to learn more information about this drug.

Don’t stop treatment with Theox Cr earlier than it was prescribed by your doctor even if you notice improvements of your condition. Stopping the medication too early may worsen your condition. Be careful about doing dangerous tasks, driving, operating machinery or climbing until you are aware how this drug affects you. Don’t drink alcohol. Always contact a medic before giving Theox Cr to a child.

What symptoms or conditions should I report to a doctor before I take this medicine?

It is important to report to a doctor if you have or had the following conditions:

  • hyperthyroidism
  • heart failure
  • chronic alcoholism
  • viral infections
  • elderly people
  • an unusual or allergic reaction to Theox Cr, other medicines, foods, dyes or preservatives
  • peptic ulcer
  • irregular heart beats (arrhythmias)
  • liver disease
  • very high blood pressure (severe hypertension)

How do I take this medicine?

Note: This remedy was prescribed to you only. Do not share this medicament with others. Follow strictly your doctor’s prescription. Do not take more or longer than your doctor recommended.

This medicine should be taken orally with some water. Take tablets with food. Tablets should not be cut or crushed. Take your doses at regular intervals. Never take the drug more often than directed.



Taking any medicine in large doses you can have serious consequences for your health. If you feel an overdose, contact your health care professional instantly.

Symptoms of Theox Cr overdose include insomnia, nervousness, convulsion, nausea, extreme thirst, arrhythmia, headache, vomiting, and loss of appetite.

What should be done if I missed the dose?

In case you forgot to take the dose, take it at your earliest opportunity. Never double your dose if it is almost time for your next dose. Take only one dose at once.


  • disulfiram
  • aminoglutethimide
  • lithium
  • some antibiotics or anti infectives
  • adenosine
  • interferon
  • tacrine
  • allopurinol
  • some medicines for treating seizures
  • methotrexate
  • sulfinpyrazone
  • pentoxifylline
  • caffeine
  • fluvoxamine
  • cimetidine
  • medicines for colds and breathing difficulties
  • ephedrine
  • some medicines used during surgery
  • isoproterenol
  • medicines for anxiety or sleep
  • some medicines for irregular heart rhythms

This list of interactions may be not complete. Provide your medical practitioners entire list of medicines, herbs, dietary supplements or non-prescription drugs you take. Moreover tell them whether you drink alcohol, use illegal drugs or smoke. Particular items may interact with your drug.

Which side effects may I observe from this medication?

Side effects that you should inform your physician immediately:

  • hallucinations
  • swelling of the feet or hands
  • allergic reactions like skin rash, swelling of the lips, face or tongue, difficulty breathing, itching or hives
  • irregular heartbeat
  • tender, bleeding, or swollen gums

Side effects that as a rule don’t need medical awareness (report to your health care provider if they maintain or become irritating):

  • nausea
  • trembling
  • headache
  • nervousness
  • increased urination
  • trouble in sleeping
  • fast heartbeat

Some of the existing side effects may not be included in the list.

What do I have to know when I take this medicine?

This medicament is manufactured under different brands. Do not change the brand until you come to agreement with the doctor regarding this question. Different brands may act in a different manner in your body. Visit your doctor or health care professional to check the treatment process. They’ll schedule regular tests. You should provide the health care professional with absence of changes or worsened health state. Inform all your doctors that you use this medicine.

Inquire to your doctor before you start or finish ANY drugs with or without the prescription. Moreover negotiate with your health care professional according nutrition that affects this medicine, like chocolate, coffee, tea and charcoal-broiled foods. If you smoke tobacco or marijuana you may affect the level of this medicament in your body. Alcohol may influence the effect of this drug. Try not to take alcoholic drinks.


Theox Cr should be stored at room temperature, between 15 and 30 degrees C (59 and 86 degrees F), in a tightly closed container. Protect from moisture, direct heat, and light. Do not store in the bathroom or near a sink. Keep Theox Cr out of the reach of children and away from animals.

Warning: Before taking the drug you need to consult your doctor. The information contained in this article is not intended to cover all possible precautions, drug interactions, adverse effects, directions, uses, allergic reactions or warnings.

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