Ace Your First Aid for the USMLE Step 1 (2020) Classes and Exams with Picmonic: #1 Visual Mnemonic Study Tool for Medicine (MD/DO) Students
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First Aid for the USMLE Step 1 (2020) | Medicine (MD/DO) School Study Aid
Trimethoprim
- Mechanism of Action
- Bacteriostatic
- Inhibits Bacterial Dihydrofolate Reductase
- Causes Sequential Block of Folate Synthesis
- Used in Combination with Sulfamethoxazole
- Combination Used For Recurrent Urinary Tract Infections
- Indications
- Shigella
- Salmonella
- Pneumocystis Jiroveci Pneumonia
- Side Effects
- Decrease in Red and White Blood Cells
- Alleviated with Leucovorin Rescue
2 mins
Sulfonamides Mechanisms
- Bacteriostatic
- Gram-Positive
- Gram-Negative
- Nocardia
- Chlamydia
- PABA antimetabolites
- Inhibit dihydropteroate synthase
- Sulfamethoxazole
- Sulfisoxazole
- Sulfadiazine
1 min
Fluoroquinolones Antibiotics
- -floxacin
- Mechanism of Action
- Inhibits Topoisomerase II & IV
- Bactericidal
- Indications
- Gram-negative Rods
- Pneumonia
- Gastrointestinal Infections
- Urinary Tract Infection
- Genital Infections
- Drugs
- Levofloxacin
- Ciprofloxacin
- Has Pseudomonas Coverage
- Considerations
- Avoid Polyvalent Cations
3 mins
Aminoglycosides
- Drug Names
- Gentamicin
- Neomycin for Bowel Surgery Prep
- Amikacin
- Tobramycin
- Streptomycin
- Mechanism of Action
- Bactericidal
- Inhibit Formation of Initiation Complex
- Cause Misreading of mRNA
- Require O2 for Uptake
- Resistance
- Resistance by Transferase Enzymes
- Acetylation
- Phosphorylation
- Adenylation
- Indications
- Gram-Negative Rod Infections
- Synergistic with B-Lactam Antibiotics
- Side Effects
- Nephrotoxicity Especially When Used with Cephalosporins
- Ototoxicity Especially When Used with Loop Diuretics
- Teratogen
5 mins
Macrolides
- Mechanism of Action
- Bacteriostatic
- Bind to 23S rRNA of 50S Subunit
- Inhibit Protein Synthesis by Blocking Translocation
- Macrolides
- Erythromycin
- Azithromycin
- Clarithromycin
- Indications
- Gram-Positive Cocci
- Atypical Pneumonia
- Chlamydia
- Considerations
- Resistance by Methylation of 23S rRNA Binding
2 mins
Daptomycin (Cubicin)
- Mechanism Of Action
- Lipopeptide Antibiotic
- Disrupts Cell Membrane
- Causes Rapid Depolarization
- Indication
- Gram-Positive Cocci
- MRSA
- Side Effects
- Myopathy
- Rhabdomyolysis
- Peripheral Neuropathy
- Considerations & Patient Education
- Inactivated by Surfactant
- Not Used (Avoid) for Pneumonia
3 mins
Rifampin
- Tuberculosis (TB)
- Blocks RNA Polymerization
- Haemophilus influenzae Type B
- Leprosy
- Meningitis
- P450 inducer
- Red-orange urine
55 secs
Penicillin
- Gram Positive
- Spirochetes
- Bind PBPs
- Block Transpeptidase Cross-linking of Cell Wall
- Activate Autolytic Enzymes
- Bactericidal
- Hypersensitivity Reactions
- Hemolytic Anemia
- Beta-lactamase Sensitive
2 mins
Metronidazole
- Mechanism of Action
- Bactericidal
- Forms Free Radical Toxic Metabolites
- Damages DNA
- Indications
- Giardia lamblia
- Entamoeba Histolytica
- Trichomonas
- Gardnerella
- Anaerobes
- Side Effects
- Metallic taste
- Disulfiram like Reaction with Alcohol
2 mins
Tetracycline Mechanism
- Binds to 30 S to Prevent Attachment of Aminoacyl tRNA
- Limited CNS Penetration
- Divalent Cations Inhibit Absorption
- Must Not Take with Milk, Antacids, Iron
1 min
