Albuterol nebulizer and metronidazole 500 mg tablet 2 times a day. Is this combination safe?

Interactions between your drugs
Moderate
metroNIDAZOLE albuterol
Applies to: metronidazole, albuterol

Moderate meaning:
Moderately clinically significant. Usually avoid combinations; use it only under special circumstances.

Using metroNIDAZOLE together with albuterol can increase the risk of an irregular heart rhythm that may be serious and potentially life-threatening, although it is a relatively rare side effect. You may be more susceptible if you have a heart condition called congenital long QT syndrome, other cardiac diseases, conduction abnormalities, or electrolyte disturbances (for example, magnesium or potassium loss due to severe or prolonged diarrhea or vomiting). Talk to your doctor if you have any questions or concerns. Your doctor may be able to prescribe alternatives that do not interact, or you may need a dose adjustment or more frequent monitoring to safely use both medications. You should seek immediate medical attention if you develop sudden dizziness, lightheadedness, fainting, shortness of breath, or heart palpitations during treatment with these medications, whether together or alone. It is important to tell your doctor about all other medications you use, including vitamins and herbs. Do not stop using any medications without first talking to your doctor.

Source and more information:
https://www.drugs.com/interactions-check.php?drug_list=109-0,1617-0

I suggest you contact your Dr. , sooner rather than later.