Taking Ampicillan for sinus infection caused by mold allergies

Can penicillin based antibiotics (Amoxicillain)  worsen a sinus infection caused by allergies toPpennicilium, Cladasporium and Asperilligus molds?

I am allergic to several molds, and have recently been prescribed Amoxicillin for a sinus infection caused by allergies.  The mucus has cleared up from green to white, but my allergy symptoms are also worse and I am having severe diarhea (diarrhea) which has left me weak, faint and exhausted.  Because of sinus blockage, my CPAP machine used for severe sleep apnea has trouble delivering the air to my lungs, so I am haing difficuly sleeping.

[Dr Rajput]

Hi, welcome to the forum, your symptoms are suggestive of infective sinusitis. The causes of these are bacterial infection like streptococcal, staphylococcal, Tuberculosis, Bronchiectasis and Fungal infections.

You need to send the mucus or throat swab for culture, microscopy, staining to rule out the pathogen and should also take chest radiograph. Antibiotic sensitivity of culture will decide the effective drug. The green color mucus suggests pseudomonal infection.

If fungal infection detected it needs appropriate systemic anti fungal. As for pseudomonas anti pseudomonial penicillin or 4th generation cephalosporin against prescription are quite effective.  

Antibiotics like amoxicillin and esp. ampicillin is associated with diarrhea. Prolonged use may result in fungal or bacterial superinfection, including C. difficile-associated diarrhea and pseudomembranous colitis. I suggest you to consult ENT specialist for evaluation sinus block. Take care and regards.

[David S. Wilson, MD, FCCP]

Several observations:  The diarrhea from the amoxicillin can be a colon infection called C.Diff. enteritis...i would stop the amoxicillin and call your doctor.  secondly, amoxicillin doesn't worsen a fungal sinusitis but it also doesn't treat it.  You may need to see and ENT doctor.