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Zaditen SRO is an extended release oral tablet consisting of an antiasthma medication called ketotifen. We carry this medication in the brand choice in 2mg.

Zaditen SRO is prescribed along with other medications to help control asthma. When used regularly, this medication can help reduce the frequency, severity, and duration of asthma attacks; it may also help with a reduction in necessary daily asthma medications. This medication should not be used to help treat an asthma attack that has already begun; you will need a short-acting asthma inhaler to help with acute asthma attacks. 

Zaditen SRO (ketotifen) is effective at reducing the frequency, severity, and duration of asthma attacks because of its ability to inhibit the substances in the body that are known to cause inflammation and symptoms of asthma.

Your doctor will tell you before prescribing you Zaditen SRO (ketotifen) exactly how to take this medication. Follow his or her directions, they can usually be found on the prescription label if you forget. This medication is most effective when used every day; create a routine by taking the tablet at the same time each day and using a pillbox or setting a reminder on your phone or in your calendar.

Typically, you would take one 2MG tablet per day. You may take the tablets with or without food; however it is directed by your doctor.

Store this medication in a closed container (ensure the lid is on tightly when not in use) at room temperature, away from risks of moisture, heat, and direct sunlight.


Some medical conditions as well as medications to treat those conditions shouldn’t be mixed with Zaditen SRO (ketotifen) as they can cause unwanted adverse interactions and sometimes be fatal. Tell your doctor about all past medical conditions as well as all medications you are currently taking including prescription, over the counter, herbal supplements and vitamins, to determine if this medication is right for you. Also tell your doctor about all drug allergies you may have to ensure this medication is safe for you to use.

There have not been enough studies to show that this medication is safe for an unborn baby if taken by the mother. Only use this medication if the benefits outweigh the potential risks of this medication, speak to your doctor if this concerns you. The same goes for those who breast feed while on this medication; it has not been established if this medication will pass into breast milk or if it will harm a nursing infant.

Tell your doctor if you take amifampridine, bupropion, donepezil, or pitolisant. These drugs may interact with this medication. If you take any other medications, be sure to tell your doctor about those ones as well.

It is important to tell your doctor if you have diabetes or epilepsy; this medication may alter low-sugar diets and may also increase the risk of seizures.

Side Effects

Common side effects of Zaditen SRO (ketotifen) may include:

  • Weight gain
  • Bloody nose
  • drowsiness
  • dryness of mouth

The above side effects should not alarm you.

Serious side effects of Zaditen SRO (ketotifen) may include:

  • blistering, itching, peeling, or redness of skin
  • bloody or cloudy urine
  • clay-colored stools 
  • convulsions
  • dark urine

If you have any of the above side effects, contact your doctor right away.

Please note this is not a complete list of side effects. Not everyone experiences side effects; they are not guaranteed. If you do have side effects and they become unmanageable, consult your doctor about alternate medications.


How long until this medication provides its full effect?

It could take anywhere from 2-4 weeks for the full effects of this drug to be present.

Can children use this medication?

Yes! This medication may be used in children 3 years old and up. Only give this medication to a child under medical advice of a doctor.

How should I store this medication?

The lid should be tightly closed when not in use and kept in room temperature. Moisture, heat, and direct sunlight may affect the drug; keep protected from moisture, heat, and direct sunlight.

Can I drink alcohol during treatment with Zaditen SRO?

You should not drink alcohol while under the influence of Zaditen SRO. This medication can increase the effects of alcohol, which can become dangerous.

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