Amoxicillin is the most widely prescribed antibiotic in the United States — used for strep throat, ear infections, pneumonia, UTIs, dental abscesses, and the H. pylori stomach ulcer protocol. This complete 2026 guide covers the full dosage chart for adults and children, the H. pylori triple and dual therapy protocols, Amoxicillin vs Augmentin vs Azithromycin, the mononucleosis rash warning, penicillin allergy guidance.

Azithromycin — the famous Z-Pack — was America's 64th most prescribed drug in 2023, with 10 million+ prescriptions. But in 2026, two important warnings every patient should know: a March 2026 UCSF study confirmed even one day of Azithromycin triggers antibiotic resistance changes, and NEJM data confirms a real cardiac risk in high-risk patients.

Doxycycline was the 77th most prescribed drug in the USA in 2023 — and in 2026 it's more relevant than ever. The CDC has just formally endorsed it as DoxyPEP, a new STI prevention strategy shown to reduce syphilis and chlamydia by over 70%. This complete guide covers the full dosage by condition, Hyclate vs Monohydrate, the DoxyPEP guidelines, side effects, drug interactions, and how to buy genuine Doxycycline 100mg online with free USA shipping.