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Theodur (Theophylline SR 12 HR)

Qty-Price (USD)
There is no brand product of Theodur.

Generic Equivalent of Theodur
Qty-Price (USD)
Type: drug type
Product: Theophylline SR 12 HR
Manufacturer: Generic
Country: Canada
Dosage: 100 mg
Type: drug type
Product: Theophylline SR 12 HR
Manufacturer: Generic
Country: Canada
Dosage: 200 mg
Type: drug type
Product: Theophylline SR 12 HR
Manufacturer: Generic
Country: Canada
Dosage: 300 mg

Theodur online Canadian Pharmacy

Theodur Information

reviewed by Dr. HaVy Ngo, Pharmacist on 5/30/2022 10:45:03 AM.

Theo-Dur Details (Brand and Generic) offers Theodur at very competitive prices. We currently have the generic Theophylline SR 12 HR also called Apo-Theo LA manufactured by Apotex. The brand name version is unavailable.


The generic Theodur is available in the strength of 100 mg, 200 mg, and 300 mg extended-release 12 Hr tablets. The dosage is based on your medical condition, response to treatment, age, lab tests (theophylline blood levels), weight, and other medications you may be taking. Your doctor may adjust your dose as needed.

High protein/low carbohydrate or low protein/high carbohydrate can change the effect of theophylline. Inform your prescriber if you have a major change with your diet.


Theo-Dur (Theophylline SR 12 HR) is a prescription medication that is used for the treatment of lung diseases such as asthma, bronchitis and emphysema. Theophylline is a bronchodilator. It belongs to the class of drugs known as xanthines. This medication works by relaxing muscles around the airway in the lungs. As a result, this medication helps you breathe more easily. And ultimately, The-Dur help decrease time lost from work or school due to breathing problems. Theophylline must be used regularly to be effective. This medication does not work right away and should not be used to as a rescue inhaler. For quick relief, you should use your rescue inhaler such as Albuterol, Proair HFA, Proventil and Ventolin inhaler.

Side Effects and Precautions

Stop using the medication and get medical care if you have an allergic reaction. Signs of an allergic reaction may include difficulty breathing, hives (rash on your body), swelling of your face, lips, tongue, or throat—If you experience any of these symptoms, please call 911 or seek emergency medical care at the nearest emergency room (ER).

The common side effects of Theodur may include: abdominal or stomach pain, diarrhea, headache, increased urination, irritability, nausea or vomiting, nervousness and restlessness. Notify your doctor or seek emergency medical care if you have any serious side effects such as:
• An allergic reaction (itching, rash, swelling, difficult breathing);
• Confusion;
• Dizziness;
• Fainting;
• Fast or slow or irregular heartbeat;
• Muscle cramps;
• Persistent headache, or insomnia;
• Seizures;
• Severe nausea and vomiting

The above information is a summary and may not contain all information. If you still have questions about side effects, you should talk to your doctor or pharmacist so they can address all your concerns.

Warnings and Interactions

You should not use Theodur if you are allergic to Theophylline or to other xanthine drugs or to any of the ingredients in this medication. You should also tell your doctor about your medical history especially of:
• Any other allergies;
• Heart failure or any type of heart conditions;
• High blood pressure;
• Seizures;
• Stomach/intestinal ulcer;
• Thyroid disorder

Alcohol and caffeine can increase the side effects of this medication. Cigarette and marijuana can decrease the blood levels of this medication. Tell your doctor if you are a smoker or recently stopped smoking. Also tell your doctor if you have any major changes to your diet. Consult your doctor if you are pregnant or breastfeeding. Talk to your doctor before using this medication if you are breast-feeding as theophylline can pass into breastmilk.

Talk to your doctor about all the medications you take including prescription, OTC, and herbal medications. There may be an interaction between Theodur and other medications, especially: carbamazepine, fluvoxamine, mexiletine, propranolol, rifampin, St. John’s wort, ticlopidine, medications containing aminophylline or oxtriphylline.

Not all possible drug interactions are listed here. Talk to your pharmacist about any questions regarding drug interactions that you may have.

What is Theodur used for in dogs and cats?

Theodur for pets is a drug which helps to dilate, or open up the airways. It is prescribed off-licence for dogs and cats with a cough due to spasm or constriction of the airways, such as cough triggered by bronchitis, air way irritation, or chronic obstructive airway disease. This is reviewed by Dr Pippa Elliott, BVMS MRCVS.

What are the side effects of Theophylline for dogs?

Theophylline for dogs and cats is related to caffeine and can have similar side effects, such as hyper excitability and a racing heart. Other side effects include vomiting, diarrhea, restlessness, and muscle tremors. This is reviewed by Dr Pippa Elliott, BVMS MRCVS.

Why is Theo-Dur more affordable from Canada than the United States?

In general, all drug prices, not only Theodur, are more affordable to order from Canada because the price of both the brand and generic medication is regulated by the government. Also, since we established in 2006, our vision is to provide safe and affordable medication to people in the US.

Is it safe to buy Theo-Dur from your pharmacy?

Our products are sourced only from facilities certified by authorities in the countries we import them from. has a rigorous process for selecting our partners, so that you, our customer, get the safest medicine. We are also a Certified Canadian Pharmacy that adheres to the requirements imposed by the Province of British Columbia.

How much does Theo-Dur generic cost at your pharmacy?

Generic Theodur 100 mg starts at $37.99 for 100 tablets, and 300 mg starts at $47.99 for 100 tablets.

How much is the shipping?

Our shipping fee is a flat rate of $10.00 per order. Our pharmacy focuses on getting you the lowest prices on high-quality products.

How do I order from your pharmacy?

Ordering Theodur from us is very simple. You can place the order online or call Customer Service at 1866.920.3784. For additional information or questions on the ordering process, visit our How to Order page.

Are your Theo-Dur prices competitive?

Yes, we are taking great pride in offering some of the most competitive prices across Canadian pharmacies. In some cases, we might be able to either match or beat our competitors' prices. Please call our friendly customer service at 1866.920.3784.

Is there a limit on how many Theo-Dur tablets I am allowed to order at one time? can only dispense a maximum of a three-month supply of Theodur at one time, as per your doctor's prescription.

Can I buy Theodur over the counter from you?

No, Theodur requires a valid prescription from your doctor. We do not sell this product without a valid prescription.

Do you ship to the United States?

Yes, we do. It usually takes between 7 and 18 business days to receive your order from our pharmacy.

Is there a generic for TheoDur?

Yes, there is a generic version for Theodur called Theophylline.

The generic alternative is not manufactured by the company that makes the brand product.

Similar Drugs in the category of Asthma Medication/ Respiratory Disorders:

   Flovent Inhaler    Advair    Symbicort Inhalation Aerosol    Spiriva Caps and Device    Albuterol

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