Hi Tony,
If the antibiotic has been given an adequate topside trial and no problematic side effects have been experienced (e.g., nausea, diarrhea, vomiting, rash), the diver stays very well hydrated, and the prescribing doctor hasn't cautioned against scuba while taking the drug, then the medication itself probably doesn't pose a meaningful risk for diving itself.
Likely of more concern is the medical condition for which the antibiotic is being taken. The infection being treated should involve no signs or symptoms that could pose a threat to safe scuba, e.g., significant fever, chills, pain/ache/tenderness, tiredness/fatigue/lack of stamina. There also should be no concern that the infection might be exacerbated as a result of such events as exposure to pathogen containing water and vigorous physical activity
It should be noted that Cipro (ciprofloxacin), Levaquin (levofloxacin) and other drugs of this class (fluoroquinolones) make the skin more sensitive to sunlight, sometimes much more. Divers taking one of these antibiotics will want to exercise great care regarding u/v exposure.
This is educational only and does not constitute or imply a doctor-patient relationship. It is not medical advice to you or any other individual, and should not be construed as such.
Helpful?
Regards,
DocVikingo