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Generic Name: theophylline, ephedrine, and phenobarbital (Oral route)

thee-OF-i-lin, e-FED-rin hye-droe-KLOR-ide, fee-noe-BAR-bi-tal

Commonly used brand name(s)

In Canada


Available Dosage Forms:

Tablet Tablet, Extended Release

Therapeutic Class: Bronchodilator, Xanthine Combination

Pharmacologic Class: Ephedrine

Chemical Class: Methylxanthine

Uses For Tedral

Theophylline, ephedrine, and phenobarbital combination is used to treat the symptoms of bronchial asthma, asthmatic bronchitis, and other lung diseases. This medicine relieves cough, wheezing, shortness of breath, and troubled breathing. It works by opening up the bronchial tubes (air passages) of the lungs and increasing the flow of air through them.

Products containing theophylline, ephedrine, and phenobarbital were withdrawn from the U.S. market by Parke Davis in April, 1993.

Before Using Tedral

In deciding to use a medicine, the risks of taking the medicine must be weighed against the good it will do. This is a decision you and your doctor will make. For this medicine, the following should be considered:


Tell your doctor if you have ever had any unusual or allergic reaction to this medicine or any other medicines. Also tell your health care professional if you have any other types of allergies, such as to foods, dyes, preservatives, or animals. For non-prescription products, read the label or package ingredients carefully.


Newborn infants may be especially sensitive to the effects of theophylline, ephedrine, and phenobarbital combination. This may increase the chance of side effects during treatment.


Patients older than 60 years of age may be especially sensitive to the effects of theophylline, ephedrine, and phenobarbital combination. This may increase the chance of side effects during treatment.

Pregnancy Pregnancy Category Explanation All Trimesters D Studies in pregnant women have demonstrated a risk to the fetus. However, the benefits of therapy in a life threatening situation or a serious disease, may outweigh the potential risk. Breast Feeding PhenobarbitalEphedrine

There are no adequate studies in women for determining infant risk when using this medication during breastfeeding. Weigh the potential benefits against the potential risks before taking this medication while breastfeeding.


Studies in women suggest that this medication poses minimal risk to the infant when used during breastfeeding.

Interactions with Medicines

Although certain medicines should not be used together at all, in other cases two different medicines may be used together even if an interaction might occur. In these cases, your doctor may want to change the dose, or other precautions may be necessary. When you are taking this medicine, it is especially important that your healthcare professional know if you are taking any of the medicines listed below. The following interactions have been selected on the basis of their potential significance and are not necessarily all-inclusive.

Using this medicine with any of the following medicines is not recommended. Your doctor may decide not to treat you with this medication or change some of the other medicines you take.

Boceprevir Cyclopropane Halothane Isocarboxazid Nifedipine Praziquantel Ranolazine Rasagiline Rilpivirine Selegiline Voriconazole

Using this medicine with any of the following medicines is usually not recommended, but may be required in some cases. If both medicines are prescribed together, your doctor may change the dose or how often you use one or both of the medicines.

Abiraterone Acenocoumarol Adinazolam Alfentanil Alprazolam Amobarbital Anileridine Anisindione Aprobarbital Bortezomib Bromazepam Brotizolam Bupropion Butabarbital Butalbital Cabazitaxel Carisoprodol Chloral Hydrate Chlordiazepoxide Chlorzoxazone Cimetidine Ciprofloxacin Clobazam Clonazepam Clorazepate Clorgyline Codeine Crizotinib Dantrolene Dasatinib Deferasirox Delavirdine Desogestrel Diazepam Dicumarol Dienogest Dronedarone Drospirenone Enoxacin Erlotinib Erythromycin Estazolam Estradiol Cypionate Estradiol Valerate Ethchlorvynol Ethinyl Estradiol Ethynodiol Diacetate Etintidine Etonogestrel Etravirine Everolimus Fentanyl Flunitrazepam Flurazepam Fluvoxamine Furazolidone Halazepam Halothane Hydrocodone Hydromorphone Idrocilamide Imatinib Imipenem Iproniazid Irinotecan Ixabepilone Ketazolam Ketorolac Lapatinib Levofloxacin Levonorgestrel Levorphanol Linagliptin Lopinavir Lorazepam Lormetazepam Maraviroc Medazepam Medroxyprogesterone Acetate Meperidine Mephenesin Mephobarbital Meprobamate Mestranol Metaxalone Methocarbamol Methohexital Methoxyflurane Mexiletine Midazolam Midodrine Morphine Morphine Sulfate Liposome Naproxen Nialamide Nilotinib Nitrazepam Nordazepam Norelgestromin Norethindrone Norgestimate Norgestrel Oxazepam Oxycodone Oxymorphone Pargyline Pefloxacin Peginterferon Alfa-2a Pentobarbital Phenelzine Phenindione Phenobarbital Phenprocoumon Prazepam Primidone Procarbazine Propoxyphene Quazepam Quetiapine Remifentanil Rivaroxaban Rofecoxib Roflumilast Romidepsin Secobarbital Sirolimus Sodium Oxybate Sufentanil Sunitinib Tacrolimus Tapentadol Temazepam Temsirolimus Teniposide Thiabendazole Thiopental Ticagrelor Tolvaptan Tranylcypromine Triazolam Troleandomycin Vandetanib Vemurafenib Zileuton Zolpidem

Using this medicine with any of the following medicines may cause an increased risk of certain side effects, but using both drugs may be the best treatment for you. If both medicines are prescribed together, your doctor may change the dose or how often you use one or both of the medicines.

Adenosine Adinazolam Alprazolam Aminoglutethimide Amiodarone Amprenavir Azithromycin Betamethasone Bexarotene Bromazepam Brotizolam Cannabis Carbamazepine Chlordiazepoxide Chlorpromazine Clobazam Clonazepam Clorazepate Clozapine Cortisone Desogestrel Dexamethasone Diazepam Dienogest Digitoxin Disulfiram Drospirenone Estazolam Estradiol Cypionate Estradiol Valerate Ethinyl Estradiol Ethosuximide Ethynodiol Diacetate Etonogestrel Febuxostat Felodipine Flunitrazepam Flurazepam Fosphenytoin Ginkgo Granisetron Griseofulvin Halazepam Interferon Alfa-2a Ipriflavone Isoproterenol Itraconazole Ketazolam Lamotrigine Leucovorin Levomethadyl Levonorgestrel Lorazepam Lormetazepam Medazepam Medroxyprogesterone Acetate Mestranol Methotrexate Methylprednisolone Metoprolol Midazolam Nilutamide Nimodipine Nitrazepam Norelgestromin Norethindrone Norgestimate Norgestrel Oxazepam Oxcarbazepine Pancuronium Pentoxifylline Phenobarbital Phenytoin Piperine Prazepam Prednisone Propafenone Quazepam Quinidine Quinine Rifampin Rifapentine Riluzole Risperidone Ritonavir Rufinamide Secobarbital St John's Wort Tacrine Tacrolimus Telithromycin Temazepam Theophylline Thioridazine Tiagabine Ticlopidine Tipranavir Topiramate Triazolam Valproic Acid Verapamil Viloxazine Warfarin Zafirlukast Interactions with Food/Tobacco/Alcohol

Certain medicines should not be used at or around the time of eating food or eating certain types of food since interactions may occur. Using alcohol or tobacco with certain medicines may also cause interactions to occur. The following interactions have been selected on the basis of their potential significance and are not necessarily all-inclusive.

Using this medicine with any of the following may cause an increased risk of certain side effects but may be unavoidable in some cases. If used together, your doctor may change the dose or how often you use this medicine, or give you special instructions about the use of food, alcohol, or tobacco.

Caffeine food Other Medical Problems

The presence of other medical problems may affect the use of this medicine. Make sure you tell your doctor if you have any other medical problems, especially:

Angle-closure glaucoma or Convulsions (seizures) or Heart or blood vessel disease or High blood pressure or Underactive adrenal gland—May make these conditions worse. Diabetes mellitus—Phenobarbital may make the condition worse; your doctor may need to change the dose of your diabetes medicine. History of drug abuse or Liver disease—The effects of phenobarbital or theophylline may be increased. Kidney disease—The effects of phenobarbital may be increased. Pain—Phenobarbital may cause unusual excitement in the presence of pain. Proper Use of Tedral

This medicine works best when taken with a glass of water on an empty stomach (either 30 minutes to 1 hour before meals or 2 hours after meals) since that way it will get into the blood sooner. However, in some cases your doctor may want you to take this medicine with meals or right after meals to lessen stomach upset. If you have any questions about how you should be taking this medicine, check with your doctor.

Take this medicine only as directed. Do not take more of it and do not take it more often than recommended on the label, unless otherwise directed by your doctor. To do so may increase the chance of serious side effects. Also, if too much is taken, the phenobarbital in this medicine may become habit-forming.

In order for this medicine to help your medical problem, it must be taken every day in regularly spaced doses as recommended. This is necessary to keep a constant amount of this medicine in the blood. To help keep the amount constant, do not miss any doses.

Make certain your health care professional knows if you are on any special diet, such as a high-protein, low-carbohydrate or low-protein, high-carbohydrate diet.


The dose of this medicine will be different for different patients. Follow your doctor's orders or the directions on the label. The following information includes only the average doses of this medicine. If your dose is different, do not change it unless your doctor tells you to do so.

The amount of medicine that you take depends on the strength of the medicine. Also, the number of doses you take each day, the time allowed between doses, and the length of time you take the medicine depend on the medical problem for which you are using the medicine.

For bronchial asthma, asthmatic bronchitis, and other lung diseases: For oral dosage form (tablets): Adults—1 or 2 tablets every 4 hours. Children weighing more than 27 kilograms (kg)—1/2 or 1 tablet every 4 hours. Children weighing less than 27 kg—Use and dose must be determined by your doctor. Missed Dose

If you miss a dose of this medicine, take it as soon as possible. However, if it is almost time for your next dose, skip the missed dose and go back to your regular dosing schedule. Do not double doses.


Store the medicine in a closed container at room temperature, away from heat, moisture, and direct light. Keep from freezing.

Keep out of the reach of children.

Do not keep outdated medicine or medicine no longer needed.

Precautions While Using Tedral

The theophylline in this medicine may add to the central nervous system stimulant effects of caffeine-containing foods or beverages such as chocolate, cocoa, tea, coffee, and cola drinks. Avoid eating or drinking large amounts of these foods or beverages while taking this medicine. If you have any questions about this, check with your doctor.

The phenobarbital in this medicine will add to the effects of alcohol and other CNS depressants (medicines that slow down the nervous system, possibly causing drowsiness). Some examples of CNS depressants are antihistamines or medicine for hay fever, other allergies, or colds; sedatives, tranquilizers, or sleeping medicine; prescription pain medicine or narcotics; other barbiturates; medicine for seizures; muscle relaxants; or anesthetics, including some dental anesthetics. Check with your doctor before taking any of the above while you are using this medicine.

A change in your usual behavior or physical well-being may affect the way this medicine works in your body. Check with your doctor if you:

have a fever of 102 °F or higher for at least 24 hours or higher than 100 °F for longer than 24 hours. start or stop smoking. start or stop taking another medicine. change your diet for a long time.

Before you have myocardial perfusion studies (a medical test that shows how well blood is flowing to your heart), tell the medical doctor in charge that you are taking this medicine. The results of the test may be affected by this medicine.

This medicine may cause some people to become dizzy, lightheaded, drowsy, or less alert than they are normally. Make sure you know how you react to this medicine before you drive, use machines, or do anything else that could be dangerous if you are dizzy or are not alert.

Tedral Side Effects

Along with its needed effects, a medicine may cause some unwanted effects. Although not all of these side effects may occur, if they do occur they may need medical attention.

Check with your doctor as soon as possible if any of the following side effects occur:

Less common or rare Heartburn and/or vomiting Symptoms of toxicity Abdominal pain, continuing or severe confusion or change in behavior convulsions (seizures) dark or bloody vomit diarrhea dizziness or lightheadedness fast and/or irregular heartbeat, continuing nervousness or restlessness, continuing trembling, continuing

Some side effects may occur that usually do not need medical attention. These side effects may go away during treatment as your body adjusts to the medicine. Also, your health care professional may be able to tell you about ways to prevent or reduce some of these side effects. Check with your health care professional if any of the following side effects continue or are bothersome or if you have any questions about them:

Less common Chest discomfort or pain drowsiness fast heartbeat headache muscle cramps nausea nervousness or restlessness trembling trouble in sleeping

Other side effects not listed may also occur in some patients. If you notice any other effects, check with your healthcare professional.

Call your doctor for medical advice about side effects. You may report side effects to the FDA at 1-800-FDA-1088.

The information contained in the Thomson Reuters Micromedex products as delivered by Drugs.com is intended as an educational aid only. It is not intended as medical advice for individual conditions or treatment. It is not a substitute for a medical exam, nor does it replace the need for services provided by medical professionals. Talk to your doctor, nurse or pharmacist before taking any prescription or over the counter drugs (including any herbal medicines or supplements) or following any treatment or regimen. Only your doctor, nurse, or pharmacist can provide you with advice on what is safe and effective for you.

The use of the Thomson Reuters Healthcare products is at your sole risk. These products are provided "AS IS" and "as available" for use, without warranties of any kind, either express or implied. Thomson Reuters Healthcare and Drugs.com make no representation or warranty as to the accuracy, reliability, timeliness, usefulness or completeness of any of the information contained in the products. Additionally, THOMSON REUTERS HEALTHCARE MAKES NO REPRESENTATION OR WARRANTIES AS TO THE OPINIONS OR OTHER SERVICE OR DATA YOU MAY ACCESS, DOWNLOAD OR USE AS A RESULT OF USE OF THE THOMSON REUTERS HEALTHCARE PRODUCTS. ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE OR USE ARE HEREBY EXCLUDED. Thomson Reuters Healthcare does not assume any responsibility or risk for your use of the Thomson Reuters Healthcare products.

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