My 5 yr old son vomited once at 4am and again today, at 6pm. Could it be a side effect of Xopenex?

Here is what I found at Drugs A to Z about this medicine, but I would call his doctor & see if he should continue or if there is something else he can take.

Possible side effects of Xopenex Solution:

All medicines may cause side effects, but many people have no, or minor, side effects. Check with your doctor if any of these most COMMON side effects persist or become bothersome:

Cough; diarrhea; dizziness; headache; nervousness; sinus inflammation; sore throat; stomach upset; stuffy nose; tremor.
Seek medical attention right away if any of these SEVERE side effects occur:

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Severe allergic reactions (rash; hives; itching; difficulty breathing; tightness in the chest; swelling of the mouth, face, lips, or tongue); chest pain; fast or irregular heartbeat; fever; new or worsened trouble breathing; pounding in the chest; severe cough; severe headache or dizziness; unusual hoarseness; wheezing.

This is not a complete list of all side effects that may occur. If you have questions about side effects, contact your health care provider. Call your doctor for medical advice about side effects. To report side effects to the appropriate agency, please read the Guide to Reporting Problems to FDA.
Good luck to you, hope this helped...