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Chemotherapeutic Agents, chapter 34-39 Antibacterial compounds (procaryotes) Antifungal compounds (eucarytotes) Antiparasitic agents (eucarytotes) Antiviral compounds Anticancer compounds
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Different living organisms
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Antibacterial compounds, chapter 34 (- antimycobacterials) Synthitic antibacterials (chemotherapeutica) Antibiotics Product from metabolism (natural product) (also applies if compd is prepared synthetically, or is a synthetic analog of a naturally occuring antibiotic/ semisynthetic compd) Inhibit growth (bacteriostatic) or kill (bacteriocide) microorg. Effective in low conc. Antimicrobial chemotherapeutics: Antimicrobial comp ≠ Antibiotics
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G+ and G- bacteria
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Synthetic antibacterials (chemotherapeutica) Antibacterial sulfonamides
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Nøytral sulfonilamid dårlig vannløselig. Urine pH ca 6: Crystallization neutral form, kidney damage Modern sulfa drugs pKa 5 – 7; better solubility Sulfametoxazol Bactrim®, Trimetoprim-Sulfa ® - Urine infections Combi. with trimethoprime
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Trimetoprim Inhib. of folate reductase
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Quinolones Inhib DNA-synthesis; DNA-gyrase (prokaryoter) uwounding DNA before replic.. DNA-topoisomerase (humans), anticancer compds. ex. doxorubicin Unique mecanism, no cross resistance Broad spectrum: G+ and G- ; also mycobactria, clamydia
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Ciprofloksacin Ciprox®, Ciprofloxacin® Cilox® Ofloksacin Tarivid® (±)
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Oxazolidones Linesolid Zyvoxid® Reg. Norge 2002, 1. antibact. drug with new mechaanism of action in 35 years Inhib. protein synthesis early No cross resist.. G+ and some G-. Resistant strains New drugs?
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Other antibiotics
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Antibiotics Penicillines -Lactam-antibiotics
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G- G+
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Semi synthesis Stability
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Nat. occuring P. Semisynthetic, increased acid stability Piperacillin Tazocin® Amoxicillin Amoxicillin®, Pivampicillin Pondocillin®, Ampicillin Pentrexyl®,
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Kloksacillin Ekvacillin® Dikloksacillin Diclocil® Meticillin Acid labile, last resort drug resist. strains
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Semisynthetic, Broad spectrum, Imines Meticillinam Selexid® Pivmeticillinam Selexid® No nucleophilic cabronyl
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- Lactamase Inhibitors Combination with penicillines Clavulanic acid Tazobaktam Mechanism based irreversible enzyme inactivators Suicide substrate - kcat inhibitors - Trojan horse inhib. - latent alkylating agent ≈ Pro-drug, must be activated by the enzyme
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Carbapenems / Carbapenins Meropenem Meronem® 2. Gen. Not cleaved by DHP-1 Imipenem + cilastan Tienam®
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Cephalosporins
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1. generation:Relatively broad spectrum (G+, some G-) Cleaved by -Lactamase Cephalexin Cefalex® Keflex® Cefalotin Cefalotin® Keflin® 2. generation:More broad spectrum Not cleaved by -Lactamase Cefoxitin Mefoxitin® Cefuroxim Cefuroxim® Zinacef®
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3. generation:Very broad spectrum, also Pseudomonas sp Not cleaved by -Lactamase Acid labile Cefotaxim Cefotaxime® Claforan® Ceftazidim Fortum® Ceftriaxon Rohephalin® Oral 3. gen (not in N): R: -H, -CH=CH 2, -CH 2 OCH 3
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Monobactams Aztreonam Azactam®
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Aminoglycosides Bind to mRNA read wrong Transloc. blocked
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Lincomycines
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Tetrasyclines Chelate
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Stability; acid / base
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Makrolides
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Polypeptides
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Others
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