You can look at the Package Insert for these drugs online.
I did a google on xopenex package insert and you can download it of the drug's website:
http://www.xopenex.com/xopenexProviders/XopenexMDI_PI.pdf
They didn't have one for the solution, which is prob what's in your nebulizer, instead of the one above, which is an inhaler. i don't konw if the formulas are the same or not.
PRECAUTIONS section says "Clinically significant changes in systolic and diastolic blood pressure have been seen in individual patients and could be expected..."
ADVERSE REACTIONS section says the most common side effects among children age 4-11 during clinical trials were
1) Accidental injury
2) Vomitting
3) Bronchitis, Pharyngitis
and in the POSTMARKETING section:
"In addition to the adverse events reported in clinical trials, the following adverse events have been observed in postapproval use of levalbuterol inhalation solution. These events have been chosen for inclusion due to their seriousness, their frequency of reporting, or their likely beta-mediated mechanism: angioedema, anaphylaxis, arrhythmias (including atrial fibrillation, supraventricular tachycardia,
extrasystoles), asthma, chest pain, cough increased, dyspnea, nausea, nervousness, rash, tachycardia, tremor, urticaria. Because these events have been reported spontaneously from a population of unknown size, estimates of frequency cannot be made.
"In addition, XOPENEX HFA Inhalation Aerosol, like other sympathomimetic agents, can cause adverse reactions such as hypertension,angina, vertigo, central nervous system stimulation, sleeplessness, headache, and drying or irritation of the oropharynx."
So, I'd guess this makes his heart race a bit.
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That aside, my sis has had asthma since she was little. She started seeing a homeopathic Dr. here in Naperville and can take a homeopathic remedy instead of using inhalers now. Homeopathic remedies have no side effects and are very effective in healing children, most often a permanent cure, even at the youngest ages. The following link is a newsletter her homeopath wrote on Asthma. Her website is the root of the link if you'd like to read more on homeopathic treatment, which I highly endorse!
http://dupagehomeopathic.com/newsletters/asthma.pdf
Very best regards -
J. S.