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Infection drugs
Antiviral, Antitubercular, Antifungal Drugs
| Question | Answer |
|---|---|
| How do antiviral drugs work? | Block the activity of the polymerase enzyme, which is used to replicate the virus and spread. |
| What do antiviral drugs treat? | Non-HIV viral infections - VZV, HSV, influenza viruses, CMV, Hepatitis A, B, C |
| Acyclovir | Treats HSV 1, HSV 2, VZV Available in PO, IV, and topical form **** Nephrotoxic*** |
| Oseltamivir phosphate | "Tamiflu" Treats type A&B influenza PO only |
| Side effects of Oseltamivir phosphate | Nausea and Vomiting |
| Zanamivir | "Relenza" Treats type A&B influenza Inhalation drug |
| Side effects of Zanamivir | Nausea Vomiting Sinusitis |
| When should Influenza treatment drugs begin? | Within 2 days of influenza symptom onset |
| Ribavirin | "Virazole" Treatment of Hep. C PO or nasal *inhalation also used for infants with respirator syncytial virus infections. |
| Antitubercular Drugs | Given for 6-12 months 2-4 antibiotics used ***Asses liver function*** |
| What are the first line antitubercular drugs? | Rifampin Isoniazid Prazinamide Ethambutol hydrochloride |
| What are the second-line antitubercular drugs? | Amikacin Sulfate Levofloxacin Hemihydrate Moxifloxacin hydrochloride |
| Isoniazid | "Isotamine" Drug of choice Side effect of hyperglycemia - from the continuous breakdown of the stored glucose |
| What are the side effects of isoniazid? | Hyperglycemia - from the continuous breakdown of the stored glucose Optic neuritis Hepatotoxicity |
| Ethambutol hydrochloride | Bacteriostatic ***concern for renal impairment*** |
| Side effects of Ethambutol hydrochloride | Optic neuritis Blindness |
| Pyrazinamide | Bacteriostatic or bactericidal Po |
| Contraindications for Pyrazinamide | Liver disease Gout - Uric acid level Pregnancy |
| Rifampin | Most potent and broad Bactericidal |
| Side effects of Rifampin | Hepatitis Liquids become orange/red Causes oral contraceptives to become ineffective |
| Bacille calmette-guerin (BCG) | Inactive strand Reduces active TB |
| What are the major categories of antifungal drugs? | Imidazoles Triazoles Echinocandins Polyenes |
| Imidazoles and triazoles | Inhibit fungal cell cytochrome P450 enzymes |
| Echinocandins | Prevent glucans - needed for funcal cell walls |
| Polyenes | Bind to sterols in fungal cell membrane |
| Amphotericin B | Broad spectrum antifungal Choice for systemic mycoses Prophylactically for immunosupressed IV only |
| Side effects | Cardiac dysrhythmias Neurotoxicity Kidney toxicity Pulmonary infiltrates |
| Contraindications of antifungal drugs | Liver failure Kidney failure Prophyria |