This is a summary of the most important information about Imitrex. For details, talk to your healthcare professional.

FDA ALERT [7/2006] � Possible Life-Threatening Serotonin Syndrome When Used With SSRI or SNRI Medicines

A life-threatening condition called serotonin syndrome can happen when medicines called 5-hydroxytryptamine receptor agonists (triptans), such as Imitrex, and medicines used to treat depression and mood disorders called selective serotonin reuptake inhibitors (SSRIs) or selective serotonin/norepinephrine reuptake inhibitors (SNRIs), are used together.� Signs and symptoms of serotonin syndrome include the following:

• restlessness
• hallucinations
• loss of coordination
• fast heart beat
• increased body temperature
• fast changes in blood pressure
• overactive reflexes
• diarrhea
• coma
• nausea
• vomiting

Serotonin syndrome may be more likely to occur when starting or increasing the dose of a triptan, SSRI, or SNRI.� This information comes from reports sent to FDA and knowledge of how these medicines work.� If you take medicines for depression or mood disorders, ask your healthcare professional if your medicine is an SSRI or SNRI.

Before you take Imitrex and an SSRI or SNRI together, talk to your healthcare professional.� If you must take these medicines together, be aware of the possibility of serotonin syndrome, and get medical care right away if you think serotonin syndrome is happening to you.�

This information reflects FDA�s current analysis of data available to FDA concerning this drug. FDA intends to update this sheet when additional information or analyses become available.

What is Imitrex?

Imitrex is used for the short term treatment of most types of migraine attacks in adults. Imitrex is not used to prevent migraines, or to decrease the number of migraine attacks. Imitrex has not been shown to treat cluster headaches.

Who Should Not Take Imitrex?

You should not take Imitrex if you have (or have had) any of following conditions:

• uncontrolled high blood pressure�
• heart disease or a history of heart disease�
• hemiplegic or basilar migraine (if you are not sure about this, ask your healthcare professional)�
• stroke�
• have circulation (blood flow) problems to your arms, legs, and bowels�
• have taken another migraine medicine in the same drug class as Imitrex or other migraine medicines that contain ergotamine, dihydroergotamine, or methylsergide in the last 24 hours (ask your healthcare professional for a list of these medicines if you are unsure)
• take a monoamine oxidase (MAO) inhibitor medicine or have taken a MAO inhibitor in the past 2 weeks
• severe liver disease

What are The Risks?

The following are the major potential risks and side effects of Imitrex therapy. However, this list is not complete.

Some signs of rare but serious side effects include:

• Possible life-threatening serotonin syndrome when used with SSRI or SNRI� medicines:� See FDA Alert [07/2006] above.
• Pain, pressure or tightness in the chest or throat. If severe, or does not go away, call your healthcare professional right away. If this happens at all, discuss with your healthcare professional before taking any more Imitrex.
• Rarely, people have a serious allergic reaction to Imitrex. This could cause shortness of breath, wheeziness, heart throbbing, swelling of eyelids, face, or lips, or a skin rash, lumps or hives. If this happens, tell your healthcare professional right away.