Shipping Update

We are now seeing improvements in our shipping times. However, things are not yet back to normal and there are still some delays occurring. We will provide updates as the situation changes.

Our normal shipping time averages 1 - 2 weeks. Due to the pandemic, shipments may sometimes take an additional 2 – 4 weeks to arrive, depending on the source country of your order. Shipments from the United Kingdom and Canada are generally quicker than from other countries.

Please note that these times are averages and individual shipping times will vary. We highly recommend that you place your order at least 2 – 4 weeks or more ahead of your normal reorder time to avoid running out of your medication.

We offer a shipping guarantee when you place an order with us. If your order does not arrive within 6 weeks from the date it was shipped, we will re-ship your order to you at no additional cost.

Call Center

Our call center hours of operation are 6:00 am – 9:00 pm Central Time on Monday to Friday, and 7:00 am – 7:00 pm Central Time on Saturday and Sunday.

If you are experiencing increased hold times or are calling outside of these hours, please leave us a message or send us an email and we will get back to you as soon as we can. Due to increased demand on telephone networks worldwide, you may experience some intermittent connection problems. If this happens our agents will call you back.

Our Commitment

If you have any questions about any changes in our service please do not hesitate to contact us. Our staff are working tirelessly to ensure the timely fulfillment and delivery of all orders. The health and safety of our customers and staff is our highest priority and we remain committed to providing service at the highest level.

We appreciate your business and thank you for your continued support.

Management and Staff
North Drugstore

Buy Zyflo CR from Canadian & International Pharmacies

Low Price Guarantee

Delivery Guarantee

30 Day Returns

Zyflo CR (Zileuton ER)

and/or alternatives
Brand Name Options

Low Price Guarantee

Delivery Guarantee

30 Day Returns

Shipping is $10.00 per order. All prices are in USD. Average shipping time is 2 weeks.
Full information about Zyflo CR

General Information On Zyflo CR

Zyflo CR is a prescription drug used to prevent asthma attacks in both children (aged less than 12 years) and adults. The drug is known by its generic name Zileuton, and it belongs to a class of drugs known as Leukotriene Synthesis Inhibitors.

Zyflo CR works by inhibiting the production of Leukotrienes, a chemical that causes inflammation and swelling in the airways of the lungs. Zyflo CR is available in tablet form and is administered orally.

Side effects of Zyflo CR

Just like other asthma medications, Zyflo CR has its share of side effects. Not all patients using Zyflo CR may suffer from its side effects. Even if the side effects occur, they are mostly mild and temporary in nature. The serious side effects of Zyflo CR are rare.

You must not buy Zyflo CR online or from a pharmacy if you are allergic to Zileuton or any other ingredients in this drug. Additionally, you must avoid using Zyflo CR if you are suffering from health problems such as liver disease. It is imperative to inform the doctor about all your health problems so that he/she can determine the correct dose after carefully assessing your condition.

The most common and minor side effects of Zyflo CR are:

  • Muscle ache
  • Mild diarrhea or stomach upset
  • cold symptoms including constant sneezing, sore throat, stuffy or runny nose, and sinus pain
  • headache or weakness

Although the above side effects are temporary and subside over time, you must consult your doctor if they worsen or persist.

The serious but rare side effects of Zyflo CR are :

  • Breathing difficulties
  • Swelling of the tongue, lips, throat or face
  • Urinating more or less than usual, dark colored urine
  • clay colored stools, skin rashes, jaundice
  • constant and sudden mood swings, suicidal thoughts, anxiety, or depression
  • deteriorating asthma symptoms
  • muscle weakness or numbness

Dosage of Zyflo CR

Doctors determine the Zyflo CR dosage for patients depending on the other health problems they have and other medications used by them. The standard recommended Zyflo CR dosage for adults and children 12 years and above is two 600 mg tablets twice a day.

If you buy Zyflo CR, make sure that you adhere to your doctor’s instructions. Typically, doctors advise patients to take the Zyflo CR daily dose 1 hour after the morning and evening meals. For the best results, take Zyflo CR at the same time each day. Avoid consuming alcohol during treatment as it may increase the risk of liver damage. Zyflo CR must be stored safely at room temperature and kept away from moisture and heat.


Zyflo CR may lead to adverse drug interactions when used in combination with other medications. This only reduces the effectiveness of Zyflo CR and other drugs, but also increases the risk of serious side effects. Before you buy Zyflo CR, inform your doctor about all the prescription and over the counter medications you are using.

The drugs that Zyflo CR may potentially interact with are:

  • Warfarin
  • Theophylline
  • Propranolol

* All trademarks and registered trademarks are the property of their respective owners.

IMPORTANT DISCLAIMER: All medical content is supplied by a third party company who is independent from this web site. As such, this web site can not guarantee the reliability, accuracy, and /or medical efficacy of the information provided. In all circumstances, you should seek the advice of a health professional pertaining to drug, treatment and/or medical condition advice. Note that not all products are shipped by our contracted Canadian pharmacy. This website contracts with dispensaries around the world that ship products directly to our customers. Some of the jurisdiction include but are not limited to United Kingdom, Europe, Turkey, India, Canada, Vanuatu, Mauritius, and USA. The items within your order may be shipped from any one of these jurisdiction depending on the availability and cost of the products at the time you place your order. The products are sourced from these countries as well as others. Please note that the product appearance may vary from actual product received depending on availability.