Infection Drugs Flashcards
Antibiotics that interfere with cell wall synthesis
Beta lactams
Glycopeptides
Antibiotics that interfere with protein synthesis
Tetracyclines
Aminoglycosides
Macrolides
Antibiotics that interfere with nucleic acid synthesis
Quinolones
Trimethoprim
Rifampicin
Cefalexin drug class
Cephalosporin
Cefalexin mechanism of action
Binds to penicillin binding proteins and disrupts bacterial cell wall synthesis leading to bacterial cell lysis and death.
Cefalexin indications
Pneumonia
Meningitis
UTI
Sinusitis
Cefalexin ADR
GI upset
Dizziness
Headache
Skin reactions
Cefalexin cautions
Renal impairment
Cefalexin DDI
Loop diuretics
Gentamicin
Penicillins
Macrolide examples
Clarithromycin
Erythromycin
Azithromycin
Macrolide mechanism of action
Inhibits bacterial protein synthesis by an effect on ribosomal translocation
Macrolide indications
Bone and joint infections Pneumonia UTI Bacterial meningitis Atypical respiratory pathogens
Macrolide cautions
May aggregate myasthenia gravis
Prolongs QT interval
Macrolide ADR
Electrolyte imbalance GI upset Headache Pancreatitis Decrease in appetite
Macrolide DDI
Other antibiotics
Atorvastatin
Penicillin examples
Amoxicillin
Flucloxacillin
Co-amoxiclav
What is co-amoxiclav ?
Amoxicillin + clavulanic acid which is a beta lactamase inhibitor
Beta lactamase is an enzyme used by certain bacteria to breakdown beta lactam antibiotics
Penicillin indications
Bacterial meningitis Bone and joint infections Skin and soft tissue infections Otitis media UTI STI
Penicillin mechanism of action
They bind to penicillin binding protein on bacteria. They then inhibit the transpeptidation enzyme which links peptidoglycan chains to form the rigid cell wall. This causes a disruption in the cell wall structure.
Penicillin caution
Allergies
Penicillin ADR
GI upset
Skin reactions
Thrombocytopenia
Penicillin DDI
Methotrexate
Other antibiotics
Phenytoin
Quinolone example
Ciprofloxacin
Quinolone mechanism of action
Inhibit topoisomerase II which is an enzyme that produces a negative supercoil and therefore permits transcription or replication.
Quinolone indications
Complicated UTI
Gonorrhoea
Pseudomonas aeruginosa cover
Quinolones ADR
GI upset
Skin reactions
Aortic dissection
Headache
Tetracycline examples
Doxycycline
Tetracycline
Tetracycline mechanism of action
Bind to bacterial ribosomes and prevent binding of tRNA. This prevents the initiation of protein synthesis
Tetracycline indications
Respiratory tract infections
Acne
Chlamydia
Lyme disease
Tetracycline cautions
Shouldn’t be given to children under 12, in pregnancy or breastfeeding people as it cuases staining of developing teeth
Tetracycline ADR
Angioedema
GI upset
Skin reactions
Photosensitivity reactions
Trimethoprim mechanism of action
It reversibly inhibits dihydrofolate reductase which is responsible for the production of an acid essential for the biosynthesis of bacterial nucleic acids and proteins
Trimethoprim indications
UTI
Trimethoprim drug class
Folate antagonist
Metronidazole mechanism of action
Not completely established however it is though it blocks nucleic acid synthesis
Metronidazole caution
Has disulfiram like actions so must avoid alcohol when using
What is metronidazole used against ?
Anaerobic bacteria and Protozoa
Nitrofurantoin drug class
Nitrofuran
Nitrofurantoin indications
UTI
Aciclovir drug class
DNA polymerase inhibitor
Aciclovir mechanism of action
Inhibits DNA polymerase in viruses
Aciclovir indications
Herpes simplex infections - genital herpes and encephalitis
Varicella zoster - chicken pox and shingles
Aciclovir ADR
Angioedema
Drowsiness
Dysarthria
Metronidazole ADR
Dry mouth
Skin reactions
Nausea