Tell me classification of antibiotics in charted form including all classes
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Classification of Antibiotics
Overview
Antibiotics (antimicrobial agents) can be classified along several dimensions: chemical structure, mechanism of action, spectrum of activity, and bactericidal vs. bacteriostatic effect. The chart below organizes by class, with all major subclasses, key agents, mechanism, and spectrum.
1. BY CHEMICAL CLASS & MECHANISM OF ACTION
🔷 CELL WALL SYNTHESIS INHIBITORS
| Class | Subclass | Key Agents | Mechanism | Spectrum |
|---|---|---|---|---|
| β-Lactams | Natural Penicillins | Penicillin G, Penicillin V | Bind penicillin-binding proteins (PBPs) → inhibit peptidoglycan cross-linking | Streptococci, anaerobes, Treponema |
| Aminopenicillins | Ampicillin, Amoxicillin | Same as above + broader gram-negative | H. influenzae, E. coli, Listeria | |
| Antistaphylococcal Penicillins | Nafcillin, Oxacillin, Dicloxacillin | Penicillinase-resistant | MSSA | |
| Antipseudomonal Penicillins | Piperacillin, Ticarcillin | Extended spectrum | Pseudomonas, gram-negatives | |
| β-Lactam + β-Lactamase Inhibitor | Amoxicillin-Clavulanate, Ampicillin-Sulbactam, Piperacillin-Tazobactam, Ceftazidime-Avibactam | Overcome β-lactamase resistance | Broad spectrum including β-lactamase producers | |
| Cephalosporins | 1st Generation | Cephalexin, Cefazolin | PBP binding | Gram-positive, some gram-negative (E. coli, Klebsiella) |
| 2nd Generation | Cefuroxime, Cefaclor, Cefoxitin | Expanded gram-negative | H. influenzae, Moraxella, some anaerobes | |
| 3rd Generation | Ceftriaxone, Cefotaxime, Ceftazidime | Further expanded | Gram-negatives, meningitis, gonorrhea | |
| 4th Generation | Cefepime | Broad including Pseudomonas | Gram-positive + extended gram-negative | |
| 5th Generation | Ceftaroline, Ceftobiprole | Binds MRSA PBP2a | MRSA + gram-negatives | |
| Carbapenems | — | Imipenem, Meropenem, Ertapenem, Doripenem | Modified thiazolidine ring; broad PBP binding | Widest spectrum; ESBL organisms, anaerobes |
| Monobactams | — | Aztreonam | Single β-lactam ring; PBP3 binding | Gram-negative only (no anaerobes, no gram-positive) |
| Glycopeptides | — | Vancomycin, Teicoplanin | Bind D-Ala-D-Ala terminus of peptidoglycan precursors | Gram-positive only; MRSA, C. diff |
| Lipoglycopeptides | — | Dalbavancin, Oritavancin, Telavancin | Enhanced vancomycin mechanism + membrane disruption | MRSA, VRE (some) |
| Fosfomycin | — | Fosfomycin | Inhibits MurA (early peptidoglycan synthesis step) | UTI: E. coli, Enterococcus faecalis |
| Cycloserine | — | D-Cycloserine | Inhibits D-Ala racemase/synthetase | Mycobacterium tuberculosis (2nd line) |
🔶 CELL MEMBRANE DISRUPTORS
| Class | Key Agents | Mechanism | Spectrum |
|---|---|---|---|
| Polymyxins | Polymyxin B, Colistin (Polymyxin E) | Bind lipopolysaccharide (LPS); disrupt outer membrane of gram-negatives | MDR gram-negatives (Pseudomonas, Acinetobacter, Klebsiella) |
| Lipopeptides | Daptomycin | Ca²⁺-dependent insertion into gram-positive membrane → depolarization | MRSA, VRE (NOT for lung infections — inactivated by surfactant) |
🔷 PROTEIN SYNTHESIS INHIBITORS (30S Ribosomal Subunit)
| Class | Key Agents | Mechanism | Spectrum | Cidal/Static |
|---|---|---|---|---|
| Aminoglycosides | Gentamicin, Tobramycin, Amikacin, Streptomycin, Neomycin | Bind 30S → irreversible → misread mRNA → faulty proteins | Gram-negatives, synergy with β-lactams vs. gram-positives | Bactericidal |
| Tetracyclines | Tetracycline, Doxycycline, Minocycline | Block aminoacyl-tRNA binding to 30S | Broad spectrum; Chlamydia, Rickettsia, Mycoplasma, Lyme, MRSA (SSTI) | Bacteriostatic |
| Glycylcyclines | Tigecycline | Overcomes tetracycline efflux resistance; 30S binding | Broad; MDR organisms, Acinetobacter (NOT Pseudomonas) | Bacteriostatic |
🔶 PROTEIN SYNTHESIS INHIBITORS (50S Ribosomal Subunit)
| Class | Key Agents | Mechanism | Spectrum | Cidal/Static |
|---|---|---|---|---|
| Macrolides | Erythromycin, Azithromycin, Clarithromycin | Bind 23S rRNA of 50S → block translocation | Atypicals (Mycoplasma, Legionella, Chlamydia), gram-positives | Bacteriostatic (cidal at high dose) |
| Azalides | Azithromycin | Subclass of macrolides; prolonged tissue half-life | Same as macrolides + extended gram-negative | Bacteriostatic |
| Ketolides | Telithromycin | Modified macrolide; binds 50S at two sites | Macrolide-resistant Streptococcus pneumoniae | Bacteriostatic |
| Lincosamides | Clindamycin, Lincomycin | Bind 50S → inhibit peptide elongation | Gram-positives, anaerobes (not gram-negatives) | Bacteriostatic |
| Streptogramins | Quinupristin-Dalfopristin | Two components synergistically bind 50S | VRE (E. faecium), MRSA | Bactericidal (combination) |
| Oxazolidinones | Linezolid, Tedizolid | Bind 50S + prevent formation of 70S initiation complex | MRSA, VRE, MDR-TB | Bacteriostatic |
| Chloramphenicol | Chloramphenicol | Binds 50S → inhibits peptidyl transferase | Broad (gram+, gram−, anaerobes); meningitis (H. influenzae, meningococcus); typhoid | Bacteriostatic |
🔷 NUCLEIC ACID SYNTHESIS INHIBITORS
| Class | Key Agents | Mechanism | Spectrum | Cidal/Static |
|---|---|---|---|---|
| Fluoroquinolones | Ciprofloxacin, Levofloxacin, Moxifloxacin, Gemifloxacin, Norfloxacin | Inhibit DNA gyrase (gram-negative) and Topoisomerase IV (gram-positive) | Broad spectrum (gram+, gram−, atypicals) | Bactericidal |
| Quinolones | Nalidixic acid | Inhibit DNA gyrase | Gram-negative (UTIs only) | Bactericidal |
| Rifamycins | Rifampin, Rifabutin, Rifaximin | Inhibit DNA-dependent RNA polymerase (β-subunit) | TB, leprosy, MRSA (combination), H. influenzae prophylaxis | Bactericidal |
| Nitroimidazoles | Metronidazole, Tinidazole | Reduced to toxic intermediates → DNA strand breaks | Strict anaerobes, protozoa (Giardia, Trichomonas, Entamoeba) | Bactericidal |
| Nitrofurans | Nitrofurantoin | Reduced by bacterial enzymes → reactive intermediates → damage DNA, proteins, ribosomes | UTI: E. coli, Enterococcus | Bactericidal (high conc.) |
🔶 FOLATE SYNTHESIS INHIBITORS
| Class | Key Agents | Mechanism | Spectrum | Cidal/Static |
|---|---|---|---|---|
| Sulfonamides | Sulfamethoxazole, Sulfadiazine, Sulfadoxine | Competitive inhibition of dihydropteroate synthase → block folate synthesis | Broad gram+/gram−, Toxoplasma, Nocardia | Bacteriostatic |
| Diaminopyrimidines | Trimethoprim | Inhibit dihydrofolate reductase (DHFR) | Gram+/gram−, synergistic with sulfonamides | Bacteriostatic |
| Combination | Trimethoprim-Sulfamethoxazole (TMP-SMX, Co-trimoxazole) | Sequential blockade of folate synthesis (two steps) | Broad + PCP (Pneumocystis), Nocardia, Stenotrophomonas, MRSA (SSTI) | Bactericidal (combination) |
2. SUMMARY CHART BY MECHANISM
MECHANISM | ANTIBIOTIC CLASSES
-----------------------------------+---------------------------------------------------
Cell Wall Synthesis Inhibition | β-Lactams (Penicillins, Cephalosporins, Carbapenems,
| Monobactams), Glycopeptides, Lipoglycopeptides,
| Fosfomycin, Cycloserine
-----------------------------------+---------------------------------------------------
Cell Membrane Disruption | Polymyxins, Daptomycin (Lipopeptides)
-----------------------------------+---------------------------------------------------
30S Ribosomal Inhibition | Aminoglycosides, Tetracyclines, Glycylcyclines
-----------------------------------+---------------------------------------------------
50S Ribosomal Inhibition | Macrolides, Ketolides, Lincosamides,
| Streptogramins, Oxazolidinones, Chloramphenicol
-----------------------------------+---------------------------------------------------
DNA/RNA Synthesis Inhibition | Fluoroquinolones, Quinolones, Rifamycins,
| Nitroimidazoles, Nitrofurans
-----------------------------------+---------------------------------------------------
Folate Synthesis Inhibition | Sulfonamides, Trimethoprim, TMP-SMX
-----------------------------------+---------------------------------------------------
3. BACTERICIDAL vs. BACTERIOSTATIC
| Bactericidal | Bacteriostatic |
|---|---|
| β-Lactams, Vancomycin, Aminoglycosides, Fluoroquinolones, Metronidazole, Rifampin, Daptomycin, Polymyxins | Tetracyclines, Macrolides, Lincosamides, Chloramphenicol, Oxazolidinones, Sulfonamides, Trimethoprim |
Note: Bacteriostatic agents can become bactericidal at high concentrations or against specific organisms.
4. SPECTRUM SUMMARY
| Spectrum | Drug Classes |
|---|---|
| Gram-positive only | Vancomycin, Daptomycin, early Penicillins |
| Gram-negative only | Aztreonam, Polymyxins |
| Broad (G+ and G−) | Carbapenems, 3rd/4th gen Cephalosporins, Fluoroquinolones, TMP-SMX, Tigecycline |
| Atypical organisms | Macrolides, Tetracyclines, Fluoroquinolones |
| Anaerobes | Metronidazole, Clindamycin, Carbapenems, Piperacillin-Tazobactam |
| MRSA | Vancomycin, Daptomycin, Linezolid, Ceftaroline, TMP-SMX (SSTI), Doxycycline (SSTI) |
| Mycobacteria (TB) | Rifampin, Isoniazid, Pyrazinamide, Ethambutol, Aminoglycosides, Fluoroquinolones |
Sources: Goodman & Gilman's The Pharmacological Basis of Therapeutics; Fishman's Pulmonary Diseases and Disorders; Lippincott Illustrated Reviews: Pharmacology
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