05.1 Antibiotics Flashcards
What are some examples of penicillins?
Penicillin, amoxicillin, flucloxacillin, co-amoxiclav
What is the mechanism of action of penecillins?
Beta lactam
Inhibits the formation of cross links in peptidoglycan walls
What are some ADRs of penecillin?
Hypersensitivity
Rash
Neurotoxic
Urticaria
What antibiotic are penecillins antagonised by?
Tetracyclines
What are some examples of cephalosporins?
Ceftriaxone, cefotaxime, cefador, aztreonam
What is the mechanism of action of cephalosporins?
Beta lactam
Inhibits the formation of cross links in peptidoglycan walls
What are some ADRs of cephalosporins?
Hypersensitivity
GI upsets
People who are allergic to penecillin are likely allergic to cephalosporins
What are some examples of tetracyclines?
Tetracycline, doxycycline, oxytetracycline
What is the mechanism of actions of tetracyclines?
Inhibits protein synthesis by blocking translation
What are some ADRs of tetracyclines
Headache, Raised ICP, anaphylaxis, GI upset
What can decrease the absorption of tetracyclines?
Milk
Antacids
Calcium salts
Iron salts
What are some examples of aminoglycosides?
Gentamycin, neomycin
What is the mechanism of action of aminoglycosides?
Inhibits protein synthesis by blocking the ribosome
What are some ADRs of aminoglycosides?
Ototoxicity Nephrotoxic Hypocalcaemia Hypokalaemia (ADRs seen especially with loop diuretics/vancomycin)
What are some examples of macrolides?
Erithryomycin, Clarithromycin
What is the mechanism of action of macrolides?
Inhibits protein synthesis, stops translation
What are some ADRs of macrolides?
QT elongation
Myasthenia gravis
GI upsets
How do macrolides interact with P450?
Inhibit CYPS
How does vancomycin work?
Inhibits peptidoglycan synthesis
When would vancomycin be given orally and why isn’t it usually?
C Dif
Poorly absorbed by the gut
What are some ADRs of vancomycin?
Neutropaenia, nephrotoxicity, ototoxicity
What are the drugs given to treat TB?
Rifampicin
Isoniasid
Pyrazinamide
Ethambutol
What are some ADRs of rifampicin?
Hepatotoxic
Orange secretions
What ar esome ADRs of isoniasid?
Hepatitis
Thrombocytopaenia
Peripheral Neuropathy
What are some ADRs pyrazinamide?
Arthralgia
Gout
Hepatotoxic
What are some ADRs of ethambutol?
Hepatotoxic
Optic neuritis
Red green colour blindness
Nystagmus