The 5 Most Common Antibiotics Doctors Prescribe: What You Need to Know

Quick Comparison of the Top 5 Antibiotics

Rank	Antibiotic	Class	Common Uses	Typical Adult Dosing	Key Considerations
1	Amoxicillin (± clavulanate)	Penicillin	Ear, sinus, throat infections; skin issues	500 mg every 8 hrs or 875 mg every 12 hrs	Check for allergies; widely used
2	Azithromycin	Macrolide	Respiratory infections; some STIs	Z-Pak: 500 mg day 1, then 250 mg	Short course; penicillin alternative
3	Doxycycline	Tetracycline	Acne, Lyme disease, certain pneumonias	100 mg twice daily	Avoid dairy near doses; sun protection
4	Ciprofloxacin	Fluoroquinolone	UTIs, some GI issues	250–750 mg twice daily	Used cautiously due to side effect profile
5	Cephalexin	Cephalosporin	Skin infections, UTIs	250–500 mg every 6 hrs	Often for penicillin-allergic patients

Your healthcare provider will tailor choices to your specific situation.

The way you use these medications matters just as much as which one is chosen. Here are practical steps you can take right away:

✅ Finish the entire prescribed course – even if symptoms improve early – to help prevent resistance from developing

✅ Never share antibiotics with others or save leftovers for future illnesses. Each prescription is specific to the individual and infection

✅ Take them at consistent times as directed to maintain steady levels in your body

✅ Pair with a probiotic or plain yogurt to support gut health during the course, as some people experience digestive changes

✅ Stay hydrated and eat as normally as possible unless specific restrictions apply

These small habits can make a big difference in your experience and outcomes.

While most people tolerate these medications well, it’s wise to stay vigilant. Reach out promptly if you notice:

Severe diarrhea (which could signal a more serious issue like C. diff infection)
Widespread rash
Difficulty breathing
Any unusual or concerning symptoms

Your provider is there to help guide you through any concerns.