Indications And Dosing Regimens - NAPLEX

1. What is the standard adult dosing regimen for acute asthma exacerbation oral corticosteroid "burst"?

   Prednisone $40$–$60\text{ mg}$ PO daily for $5$–$7$ days. Provides rapid anti-inflammatory effects to reduce airway inflammation and improve lung function in acute exacerbations.

2. What is the standard adult dosing regimen of valacyclovir for recurrent genital HSV episodic therapy?

   Valacyclovir $500\text{ mg}$ PO BID for $3$ days. Suppresses herpes simplex virus replication during outbreaks, reducing lesion duration and viral shedding in recurrent episodes.

3. What is the usual dosing regimen of metformin immediate-release when initiating for type $2$ diabetes?

   Metformin IR $500\text{ mg}$ PO daily or BID with meals; titrate weekly as tolerated. Starts at low dose to minimize gastrointestinal side effects while improving glycemic control through reduced hepatic glucose production.

4. What is the dosing regimen of TMP-SMX DS for uncomplicated cystitis (when appropriate)?

   TMP-SMX DS $160/800\text{ mg}$ PO BID for $3$ days. Provides effective coverage against susceptible uropathogens with a short course to minimize resistance development when local resistance is below 20%.

5. Identify the correct adult dosing regimen for levothyroxine initiation in a healthy adult with hypothyroidism.

   Levothyroxine about $1.6\ \frac{\text{mcg}}{\text{kg}}$ PO daily (full replacement in healthy adults). Weight-based dosing approximates full thyroid hormone replacement to normalize TSH levels without overtreatment in euthyroid goal.

6. What is the recommended regimen for primary syphilis in a nonpregnant adult?

   Benzathine penicillin G $2.4\text{ million units}$ IM once. Delivers treponemacidal levels to eradicate Treponema pallidum in early stages, preventing progression to secondary syphilis.

7. What is the usual adult dosing regimen of doxycycline for community-acquired pneumonia (outpatient option)?

   Doxycycline $100\text{ mg}$ PO BID for $5$–$7$ days. Offers broad coverage including atypicals and some gram-positives, serving as an alternative for patients intolerant to macrolides or beta-lactams.

8. What is the standard adult dosing regimen of omeprazole for GERD symptom control?

   Omeprazole $20\text{ mg}$ PO daily for $4$–$8$ weeks. Suppresses gastric acid production to promote esophageal healing and symptom relief in erosive or non-erosive reflux disease.

9. What is the usual adult dosing regimen of oral vancomycin for an initial episode of nonsevere C. difficile infection?

   Vancomycin $125\text{ mg}$ PO QID for $10$ days. Targets C. difficile toxins directly in the gut with minimal systemic absorption, standard for initial mild episodes to reduce recurrence risk.

10. What is the standard outpatient regimen for acute uncomplicated gonorrhea (cervix/urethra/rectum)?

    Ceftriaxone $500\text{ mg}$ IM once (add doxycycline if chlamydia not excluded). High-dose ceftriaxone ensures effective treatment of gonorrhea with added doxycycline to cover potential chlamydial co-infection.

11. What is the usual adult dosing regimen of azithromycin for community-acquired pneumonia (outpatient, no comorbidities)?

    Azithromycin $500\text{ mg}$ PO day $1$, then $250\text{ mg}$ daily days $2$–$5$. This macrolide regimen covers atypical pathogens like Mycoplasma and Chlamydia, suitable for healthy outpatients with low risk of resistance.

12. What is the usual adult dosing regimen of oseltamivir for treatment of influenza?

    Oseltamivir $75\text{ mg}$ PO BID for $5$ days. Inhibits influenza neuraminidase to reduce viral replication and symptom duration when started within 48 hours of onset.

13. What is the standard starting dose of lisinopril for hypertension in adults?

    Lisinopril $10\text{ mg}$ PO daily (lower if on diuretic or CKD per clinician judgment). Initiates ACE inhibition at a dose balancing efficacy and tolerability, adjustable based on blood pressure response and comorbidities.

14. What is the first-line empiric outpatient regimen for uncomplicated cystitis in a nonpregnant woman?

    Nitrofurantoin $100\text{ mg}$ PO BID for $5$ days. Recommended as first-line due to high efficacy against E. coli with low resistance rates and favorable safety profile in nonpregnant women without complicating factors.

15. What is the standard regimen for trichomoniasis in women (preferred regimen)?

    Metronidazole $500\text{ mg}$ PO BID for $7$ days. Achieves high tissue concentrations to eradicate Trichomonas vaginalis, preferred for its efficacy and tolerability in symptomatic women.

16. What is the standard regimen for uncomplicated chlamydia infection in nonpregnant adults?

    Doxycycline $100\text{ mg}$ PO BID for $7$ days. Provides effective intracellular activity against Chlamydia trachomatis, ensuring clearance in uncomplicated genital infections.

17. What is the usual adult dosing regimen of fidaxomicin for an initial episode of C. difficile infection?

    Fidaxomicin $200\text{ mg}$ PO BID for $10$ days. Inhibits C. difficile RNA polymerase, providing high efficacy and lower recurrence rates compared to vancomycin for initial infections.

18. What is the recommended regimen for latent syphilis of unknown duration (or late latent syphilis)?

    Benzathine penicillin G $2.4\text{ million units}$ IM weekly for $3$ doses. Ensures prolonged treponemacidal activity to treat potential persistent organisms in latent stages without neurologic involvement.

19. What is the standard adult regimen for latent tuberculosis infection with isoniazid plus rifapentine (3HP)?

    Isoniazid + rifapentine once weekly for $12$ weeks (directly observed or self-administered per protocol). Short-course combination targets latent Mycobacterium tuberculosis with high completion rates and efficacy equivalent to longer regimens.

20. What is the standard regimen for H. pylori clarithromycin triple therapy (when used)?

    PPI BID + amoxicillin $1\text{ g}$ BID + clarithromycin $500\text{ mg}$ BID for $14$ days. Utilizes acid suppression with dual antibiotics targeting H. pylori in regions with low clarithromycin resistance for effective eradication.

21. What is the usual adult dosing regimen of oseltamivir for post-exposure prophylaxis of influenza?

    Oseltamivir $75\text{ mg}$ PO daily for $7$ days after last exposure. Prevents influenza replication in exposed individuals, reducing infection risk in close contacts during outbreaks.

22. What is the usual dosing regimen of fosfomycin for uncomplicated cystitis?

    Fosfomycin tromethamine $3\text{ g}$ PO once. Single-dose administration inhibits bacterial cell wall synthesis, offering convenience and high efficacy for uncomplicated cases caused by susceptible organisms.

23. What is the standard adult outpatient dosing regimen of valacyclovir for herpes zoster?

    Valacyclovir $1\text{ g}$ PO TID for $7$ days. Inhibits varicella-zoster virus replication to shorten rash duration and reduce postherpetic neuralgia risk in immunocompetent adults.

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