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Antibiotic Mechanisms
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Ciprofloxacin
Fluoroquinolone that inhibits DNA gyrase and topoisomerase IV, effective against Gram-negative and some Gram-positive bacteria.
Colistin
Disrupts the outer cell membrane of Gram-negative bacteria by binding to lipopolysaccharide and phospholipids, used as a 'last-resort' antibiotic.
Cephalexin
Inhibits cell wall synthesis, effective against Gram-positive cocci.
Levofloxacin
Inhibits DNA gyrase and topoisomerase IV, has a broad spectrum of activity including pseudomonas.
Trimethoprim/Sulfamethoxazole (TMP/SMX)
Inhibits folic acid synthesis pathway, effective against a broad spectrum of Gram-positive and Gram-negative organisms.
Fluconazole
Inhibits fungal cytochrome P450 enzyme (14-alpha demethylase), reducing conversion of lanosterol to ergosterol, used for Candida infections and more.
Penicillin
Inhibits bacterial cell wall synthesis, primarily targets Gram-positive bacteria.
Rifampin
Inhibits DNA-dependent RNA polymerase, used for tuberculosis and as prophylaxis for meningococcus and Haemophilus influenzae type b.
Daptomycin
Inserts into the bacterial cell membrane and causes rapid depolarization, leading to inhibition of protein, DNA, and RNA synthesis, used against Gram-positive bacteria.
Amoxicillin
Inhibits cell wall synthesis by binding to penicillin-binding proteins, used against Gram-positive and some Gram-negative bacteria.
Gentamicin
Aminoglycoside that inhibits protein synthesis by binding to the 30S subunit, targets Gram-negative bacilli.
Amphotericin B
Binds to ergosterol in fungal cell membranes causing increased membrane permeability and cell death, targets a wide range of fungi.
Nystatin
Binds to ergosterol, creating pores in the fungal cell membrane, primarily used for cutaneous, oral, or intestinal Candida infections.
Vancomycin
Inhibits cell wall synthesis by binding to the D-alanyl-D-alanine portion of cell wall precursors, targets MRSA and Gram-positive bacteria.
Erythromycin
Macrolide that inhibits bacterial protein synthesis by binding to the 50S subunit, used for respiratory tract infections and more.
Chloramphenicol
Inhibits protein synthesis by binding to the 50S ribosomal subunit, broad-spectrum activity but used as a last resort due to toxicity.
Clindamycin
Inhibits protein synthesis by binding to the 50S ribosomal subunit, used mainly for anaerobic infections and Gram-positive cocci.
Metronidazole
Causes DNA strand breaks and loss of helical DNA structure, effective against anaerobic bacteria and protozoa.
Isoniazid
Inhibits the synthesis of mycolic acid in the mycobacterial cell wall, used specifically against Mycobacterium tuberculosis.
Linezolid
Inhibits protein synthesis by binding to the 23S portion of the 50S subunit, used for Gram-positive infections including VRE and MRSA.
Azithromycin
Macrolide antibiotic that inhibits protein synthesis by binding to the 50S ribosomal subunit, used for respiratory infections, some STIs, and more.
Nitrofurantoin
Damages bacterial DNA, primarily used for urinary tract infections caused by Escherichia coli and Staphylococcus saprophyticus.
Fidaxomicin
Inhibits RNA polymerase sigma subunit, targeting Clostridium difficile.
Tetracycline
Inhibits protein synthesis by binding to the 30S subunit of the bacterial ribosome, used against a broad spectrum of bacteria.
Doxycycline
Inhibits protein synthesis by binding to the 30S ribosomal subunit, effective against a variety of Gram-positive and Gram-negative bacteria.
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