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Theo-Dur No Prescription

Theo-Dur is a bronchodilator. Theo-Dur helps open up the airways in your lungs to make it easier to breathe. Theo-Dur is prescribed to treat the symptoms of asthma, bronchitis, and emphysema.

Theo-Dur Contraindications

Theo-Dur is contraindicated if you have any of the following conditions:
- Heart disease;
- If you smoke;
- Irregular heartbeat;
- Liver disease;
- Seizures;
- Stomach problems like ulcers;
- Thyroid disease;
- An unusual or allergic reaction to Theo-Dur, aminophylline, caffeine, theobromine, other drugs, foods, dyes, or preservatives;
- Pregnant or trying to get pregnant;
- Breast-feeding;
- Tell your doctor and pharmacist if you are allergic to Theo-Dur or any other drugs.
- Tell your doctor and pharmacist what script medications you are taking, especially allopurinol (Zyloprim), azithromycin (Zithromax), carbamazepine (Tegretol), cimetidine (Tagamet), ciprofloxacin (Cipro), clarithromycin (Biaxin), diuretics ('water pills'), erythromycin, lithium (Eskalith, Lithobid), oral contraceptives, phenytoin (Dilantin), prednisone (Deltasone), propranolol (Inderal), rifampin (Rifadin), tetracycline (Sumycin), and other medications for infections or heart disease.
- Tell your doctor and pharmacist what nonscript medications and vitamins you are taking, including ephedrine, epinephrine, phenylephrine, phenylpropanolamine, or pseudoephedrine. Many nonscript products contain these drugs (e.g., diet pills and medications for colds and asthma), so check labels carefully. Do not take these medications without talking to your doctor they can increase the side effects of Theo-Dur.
- Tell your doctor if you have or have ever had seizures, ulcers, heart disease, an overactive or underactive thyroid gland, high blood pressure, or liver disease or if you have a history of alcohol abuse.
- Tell your doctor if you are pregnant, plan to become pregnant, or are breast-feeding. If you become pregnant while taking Theo-Dur, call your doctor.

Theo-Dur Interactions

Do not take Theo-Dur with any of the following drugs:
- Adenosine;
- Allopurinol;
- Aminoglutethimide;
- Caffeine;
- Cimetidine;
- Disulfiram;
- Ephedrine;
- Fluvoxamine;
- Interferon;
- Isoproterenol;
- Lithium;
- Drugs for anxiety or sleep;
- Drugs for colds and breathing difficulties;
- Methotrexate;
- Pentoxifylline;
- Some antibiotics or anti infectives;
- Some drugs for irregular heart rhythms;
- Some drugs for treating seizures;
- Some drugs prescribed during surgery;
- Sulfinpyrazone;
- Tacrine;

Theo-Dur Side Effects

Theo-Dur side effects that you should report to your health care professional or doctor as soon as possible:
- Allergic reactions like skin rash, itching or hives, swelling of the face, lips, or tongue;
- Fast or irregular breathing or heartbeat;
- Feeling faint or lightheaded, falls;
- Fever, infection;
- Nausea, vomiting;
- Seizures;
- Anxiety, irritable, restless;
- Diarrhea;
- Headache;
- Increased need to pass urine;
- Tremors;
- Trouble sleeping;
- Upset stomach;
- Stomach pain;
- Diarrhea;
- Headache;
- Restlessness;
- Insomnia;
- Irritability vomiting;
- Increased or rapid heart rate;
- Irregular heartbeat;
- Seizures;
- Skin rash;

Theo-Dur Dosage


Theo-Dur Extended Release Tablets

The usual initial dose is 1 Theo-Dur 150-mg tablet every 12 hours. If this is not effective, your doctor will gradually increase the dose until you respond, up to a maximum of 600 mg per day. Once you have adjusted to the medication, your doctor may be able to put you on a once-a-day dose schedule.

Theo-Dur Sprinkle

The usual initial dose is no more than 200 mg every 12 hours. If this is not effective, your doctor will gradually increase the dose until you respond, up to a maximum of 900 mg per day. If a dose every 12 hours is inconvenient, your doctor may divide the daily total into 3 small doses taken every 8 hours.


Theo-Dur Extended Release Tablets

Maximum regular daily dosages are calculated by body weight as follows.

Less than 99 pounds--20 mg per 2.2 pounds up to a maximum of 600 mg
99 pounds or more--600 mg

Theo-Dur Sprinkle

For children under 55 pounds, a liquid preparation is recommended to establish proper dosage before switching to Theo-Dur Sprinkle. Maximum regular daily dosages are calculated by body weight as follows:

Children 6 through 8--24 mg per 2.2 pounds
Children 9 through 11--20 mg per 2.2 pounds
Children 12 through 15--18 mg per 2.2 pounds


Older adults are more likely than younger people to be seriously affected by Theo-Dur. Anyone over age 60 should not take more than 400 mg a day except in special circumstances.

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