BACTERIOSTATIC, for GRAM-POSITIVE AND GRAM-NEGATIVE; Attack the 50s ribosomal subunit. MOA: inhibit the ribosome from moving along the mRNA. They prevent the actual elongation of the peptide chain. so they inhibit from reading or moving along the mRNA. CAN TREAT: 1 PNEUMONIA, 2 H. PYLORI, 3 GASTROINTESTINAL TRACT INFECTIONS, 4 SEXUALLY TRANSMITTED DISEASES