Cidofovir nephrotoxicity, prevention (off-label use): Oral: 2 g as a single dose administered 3 hours before cidofovir infusion, followed by 1 g at 2 hours and 8 hours after cidofovir infusion (Ref).
Hyperuricemia, gout prevention (alternative agent): Oral: 250 mg twice daily for 1 week, followed by 500 mg twice daily; may increase dose by 500 mg every 4 weeks as tolerated if symptoms are not controlled; usual maintenance dose: ≤2 g/day in divided doses.
Sexually transmitted infections, as a pharmacokinetic enhancer to prolong beta-lactam serum levels (adjunctive agent):
Gonococcal infection, uncomplicated: Oral: 1 g as a single dose in combination with single-dose IM cefoxitin (Ref).
Neurosyphilis, including ocular and otosyphilis:
Note: Reserve for patients unable to receive IV therapy (Ref).
Oral: 500 mg 4 times daily in combination with IM procaine penicillin for 10 to 14 days (Ref).
Pelvic inflammatory disease, mild to moderate: Oral: 1 g as a single dose in combination with IM cefoxitin as a single dose plus doxycycline and metronidazole (Ref).
The renal dosing recommendations are based upon the best available evidence and clinical expertise. Senior Editorial Team: Bruce Mueller, PharmD, FCCP, FASN, FNKF; Jason A. Roberts, PhD, BPharm (Hons), B App Sc, FSHP, FISAC; Michael Heung, MD, MS.
Altered kidney function
eGFR ≥60 mL/minute/1.73 m2: No dosage adjustment necessary (Ref).
eGFR <60 mL/minute/1.73 m2:
Cidofovir nephrotoxicity, prevention (off-label use):
Oral: No dosage adjustment of probenecid likely necessary (Ref). Note: The use and dose of cidofovir in patients with kidney dysfunction should be evaluated separately.
Hyperuricemia, gout prevention: Oral:
eGFR ≥30 to <60 mL/minute/1.73 m2: The use of alternative agents is recommended due to reduced efficacy of probenecid in patients with eGFR <60 mL/minute/1.73 m2 (Ref). If use of probenecid is deemed appropriate, no dosage adjustment likely necessary; however, use with caution and frequent monitoring for safety and efficacy. Limited data demonstrate urate-lowering capability of probenecid in patients with eGFR 30 to 60 mL/minute/1.73 m2 without increased risk of toxicity; however, robust evidence is lacking, and better alternatives are often available (Ref).
eGFR <30 mL/minute/1.73 m2: Use not recommended (Ref).
Sexually transmitted infections, as a pharmacokinetic enhancer to prolong beta-lactam serum levels: Oral:
Note: No dosage adjustment is necessary for single dose probenecid regimens (ie, used in combination with cefoxitin for gonococcal infection or pelvic inflammatory disease) (Ref).
eGFR <60 mL/minute/1.73 m2: Since probenecid may have limited efficacy in reducing the renal clearance of beta-lactam concentrations (ie, procaine penicillin) in patients with kidney impairment, the use of probenecid in combination with procaine penicillin for the treatment of neurosyphilis should be avoided (Ref).
Hemodialysis, intermittent (thrice weekly): Oral: Avoid use (Ref).
Peritoneal dialysis: Oral: Avoid use (Ref).
CRRT: Oral: Avoid use (Ref).
PIRRT (eg, sustained, low-efficiency diafiltration): Oral: Avoid use (Ref).
There are no dosage adjustments provided in the manufacturer's labeling.
Refer to adult dosing.
(For additional information see "Probenecid: Pediatric drug information")
Prolongation of penicillin serum levels: Children ≥2 years and Adolescents: Note: Dosing for some indication-specific dosing may vary.
Patient weight ≤50 kg: Oral: Initial: 25 mg/kg/dose or 700 mg/m2/dose as a single dose; maintenance: 40 mg/kg/day or 1,200 mg /m2/day in 4 divided doses; maximum dose: 500 mg.
Patient weight >50 kg: Oral: 500 mg 4 times daily.
Gonorrhea, uncomplicated infections of cervix, urethra, and rectum: Adolescents >45 kg: Oral: 1,000 mg as a single dose with cefoxitin; Note: Combination of ceftriaxone and azithromycin is preferred (Ref).
Pelvic inflammatory disease: Adolescents: Oral: 1,000 mg as a single dose with cefoxitin in combination with doxycycline with/without metronidazole (Ref).
Neurosyphilis: Adolescents: Oral: 500 mg 4 times daily with procaine penicillin for 10 to 14 days; alternative therapy to aqueous penicillin G therapy (Ref).
Cidofovir nephrotoxicity, prevention: Limited data available; various regimens have been reported (Ref):
Infants, Children, and Adolescents: Note: The manufacturer's labeling considers use in patients <2 years of age to be contraindicated; however, clinical studies have included younger ages (including infants) for this indication.
Weight-based dosing: Oral: 25 to 40 mg/kg/dose (maximum dose: 2,000 mg) administered 3 hours before cidofovir infusion and 10 to 20 mg/kg/dose (maximum dose: 1,000 mg) at 2 to 3 hours and 8 to 9 hours after cidofovir infusion.
BSA-based dosing: Oral: 1,000 or 1,250 mg/m2/dose administered 3 hours prior to cidofovir, followed by 500 to 1,250 mg/m2/dose 1 to 2 hours and 8 hours after completion.
Children ≥2 years and Adolescents: CrCl <30 mL/minute: Avoid use (reduced efficacy with renal impairment).
There are no dosage adjustments provided in the manufacturer's labeling.
The following adverse drug reactions are derived from product labeling unless otherwise specified.
Frequency not defined:
Cardiovascular: Flushing
Dermatologic: Alopecia, dermatitis, pruritus, urticaria
Gastrointestinal: Anorexia, gingival pain, nausea, vomiting
Genitourinary: Urinary frequency
Hematologic & oncologic: Anemia, aplastic anemia, hemolytic anemia, leukopenia
Hepatic: Hepatic necrosis
Nervous system: Dizziness, headache, pain (costovertebral)
Renal: Nephrolithiasis, nephrotic syndrome, renal colic
Miscellaneous: Fever
Postmarketing: Hypersensitivity: Anaphylaxis, severe hypersensitivity reaction
Hypersensitivity to probenecid or any component of the formulation; blood dyscrasias; uric acid kidney stones; children <2 years of age; initiation during an acute gout attack.
Concerns related to adverse effects:
• Hypersensitivity reaction: Has been associated with rare, severe hypersensitivity reactions, including anaphylaxis. Discontinue therapy if reaction occurs.
• Gout: May cause exacerbation of acute gouty attack.
Disease-related concerns:
• G6PD deficiency: Use caution in patients with G6PD deficiency; may increase risk for hemolytic anemia.
• Peptic ulcer disease: Use with caution in patients with peptic ulcer disease.
• Kidney impairment: May not be effective in patients with kidney impairment; use with caution (ACR [FitzGerald 2020]; manufacturer’s labeling).
Excipient information presented when available (limited, particularly for generics); consult specific product labeling.
Tablet, Oral:
Generic: 500 mg
Yes
Tablets (Probenecid Oral)
500 mg (per each): $0.98 - $3.73
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Oral: Administer with food to minimize GI effects. Maintain adequate fluid intake.
Oral: Administer with food or antacids to minimize GI effects
Hyperuricemia, gout prevention: Treatment of hyperuricemia associated with gout or gouty arthritis.
Sexually transmitted infections, as a pharmacokinetic enhancer to prolong beta-lactam serum levels: Adjunctive agent to beta-lactams for the elevation and prolongation of plasma levels.
Cidofovir nephrotoxicity, prevention
Probenecid may be confused with Procanbid
Inhibits MRP2, OAT1/3, UGT1A4, UGT1A6
Note: Interacting drugs may not be individually listed below if they are part of a group interaction (eg, individual drugs within “CYP3A4 Inducers [Strong]” are NOT listed). For a complete list of drug interactions by individual drug name and detailed management recommendations, use the drug interactions program by clicking on the “Launch drug interactions program” link above.
Acetaminophen: Probenecid may increase the serum concentration of Acetaminophen. Probenecid may also limit the formation of at least one major non-toxic metabolite, possibly increasing the potential for formation of the toxic NAPQI metabolite. Management: Consider limiting acetaminophen use in combination with probenecid. Probenecid may reduce clearance of acetaminophen to one of its non-toxic metabolities, increasing the risk for acetaminophen toxicity, even a lower doses. Risk D: Consider therapy modification
Anagliptin: Probenecid may increase the serum concentration of Anagliptin. Risk C: Monitor therapy
Avibactam: Probenecid may increase the serum concentration of Avibactam. Risk X: Avoid combination
Baricitinib: Probenecid may increase the serum concentration of Baricitinib. Management: When baricitinib is combined with probenecid, reduce baricitinib 4 mg daily to 2 mg daily or reduce baricitinib 2 mg daily to 1 mg daily. Don't use probenecid if recommended baricitinib dose is only 1 mg daily. Risk D: Consider therapy modification
Betalactamase Inhibitors: Probenecid may increase the serum concentration of Betalactamase Inhibitors. Management: Coadministration of probenecid with amoxicillin/clavulanate is not recommended per official package labeling. Risk D: Consider therapy modification
Cabozantinib: MRP2 Inhibitors may increase the serum concentration of Cabozantinib. Risk C: Monitor therapy
Cefotaxime: Probenecid may increase the serum concentration of Cefotaxime. Management: Avoid cefotaxime doses greater than 6 grams per day with concurrent probenecid. Any patients receiving this combination should be monitored for evidence of cefotaxime toxicity. Risk D: Consider therapy modification
Cephalosporins: Probenecid may increase the serum concentration of Cephalosporins. Risk C: Monitor therapy
Clofarabine: OAT1/3 Inhibitors may increase the serum concentration of Clofarabine. Risk C: Monitor therapy
Deferiprone: UGT1A6 Inhibitors may increase the serum concentration of Deferiprone. Risk X: Avoid combination
Dexketoprofen: Probenecid may increase the serum concentration of Dexketoprofen. Risk C: Monitor therapy
Dichlorphenamide: OAT1/3 Inhibitors may increase the serum concentration of Dichlorphenamide. Risk C: Monitor therapy
Doripenem: Probenecid may increase the serum concentration of Doripenem. Risk X: Avoid combination
Dyphylline: Probenecid may increase the serum concentration of Dyphylline. Risk C: Monitor therapy
Ertapenem: Probenecid may increase the serum concentration of Ertapenem. Risk X: Avoid combination
Ganciclovir-Valganciclovir: Probenecid may increase the serum concentration of Ganciclovir-Valganciclovir. Risk C: Monitor therapy
Gemifloxacin: Probenecid may increase the serum concentration of Gemifloxacin. Risk C: Monitor therapy
Imipenem: Probenecid may increase the serum concentration of Imipenem. Risk C: Monitor therapy
Ketoprofen: Probenecid may increase the serum concentration of Ketoprofen. Risk C: Monitor therapy
Ketorolac (Nasal): Probenecid may increase the serum concentration of Ketorolac (Nasal). Risk X: Avoid combination
Ketorolac (Systemic): Probenecid may increase the serum concentration of Ketorolac (Systemic). Risk X: Avoid combination
Loop Diuretics: Probenecid may diminish the diuretic effect of Loop Diuretics. Probenecid may increase the serum concentration of Loop Diuretics. Risk C: Monitor therapy
LORazepam: Probenecid may increase the serum concentration of LORazepam. Management: Reduce lorazepam dose 50% during coadministration with probenecid. Monitor for increased and prolonged lorazepam effects, particularly CNS depressant effects. Patients using lorazepam ER capsules should be switched to lorazepam tablets. Risk D: Consider therapy modification
Meropenem: Probenecid may increase the serum concentration of Meropenem. Risk X: Avoid combination
Methotrexate: Probenecid may increase the serum concentration of Methotrexate. Management: If possible, the concomitant use of methotrexate and probenecid should be avoided. If used concomitantly, monitor closely for increased methotrexate serum concentrations and toxicities. Methotrexate dose reductions may be needed. Risk D: Consider therapy modification
Minoxidil (Systemic): Probenecid may increase the serum concentration of Minoxidil (Systemic). Risk C: Monitor therapy
Mycophenolate: Probenecid may increase the serum concentration of Mycophenolate. Risk C: Monitor therapy
Nitrofurantoin: Probenecid may diminish the therapeutic effect of Nitrofurantoin. Probenecid may increase the serum concentration of Nitrofurantoin. Risk C: Monitor therapy
Nonsteroidal Anti-Inflammatory Agents: Probenecid may increase the serum concentration of Nonsteroidal Anti-Inflammatory Agents. Risk C: Monitor therapy
Oseltamivir: Probenecid may increase serum concentrations of the active metabolite(s) of Oseltamivir. Risk C: Monitor therapy
Pegloticase: Probenecid may enhance the adverse/toxic effect of Pegloticase. Specifically, Probenecid may blunt increases in serum urate that would signal an elevated risk of anaphylaxis and infusion reactions. Risk X: Avoid combination
Penicillins: Probenecid may increase the serum concentration of Penicillins. Risk C: Monitor therapy
Pexidartinib: UGT1A4 Inhibitors may increase the serum concentration of Pexidartinib. Management: If combined use cannot be avoided, pexidartinib dose should be reduced as follows: reduce pexidartinib doses of 500 mg or 375 mg daily to 125 mg twice daily; reduce pexidartinib 250 mg daily to 125 mg once daily. Risk D: Consider therapy modification
Phenprocoumon [INT]: Probenecid may decrease the serum concentration of Phenprocoumon [INT]. Risk C: Monitor therapy
PRALAtrexate: Probenecid may increase the serum concentration of PRALAtrexate. Management: Avoid coadministration of pralatrexate with probenecid. If coadministration cannot be avoided, closely monitor for increased pralatrexate serum concentrations or possible toxicity with concomitant use of probenecid. Risk D: Consider therapy modification
Propacetamol: Probenecid may increase serum concentrations of the active metabolite(s) of Propacetamol. Specifically, accetaminophen exposure may be increased. Probenecid may also limit the formation of at least one major non-toxic acetaminophen metabolite, possibly increasing the formation of the toxic NAPQI metabolite. Management: Consider limiting the use of propacetamide in patients who are also taking probenecid. Patients may be at an increased risk for toxicity, even if reduced propacetamide doses are used. Risk D: Consider therapy modification
Quinolones: Probenecid may decrease the excretion of Quinolones. Specifically, probenecid may decreased the renal excretion of quinolone antibiotics. Probenecid may increase the serum concentration of Quinolones. Risk C: Monitor therapy
RifAMPin: Probenecid may increase the serum concentration of RifAMPin. Risk C: Monitor therapy
Roxadustat: Probenecid may increase the serum concentration of Roxadustat. Risk C: Monitor therapy
Salicylates: May diminish the therapeutic effect of Probenecid. Risk X: Avoid combination
Sodium Benzoate: Probenecid may diminish the therapeutic effect of Sodium Benzoate. Risk C: Monitor therapy
Sulbactam: Probenecid may increase the serum concentration of Sulbactam. Management: Recommendations for management of this interaction vary by specific sulbactam-containing product. Coadministration of probenecid with sulbactam/durlobactam is not recommended, but no specific actions are recommended for ampicillin/sulbactam. Risk D: Consider therapy modification
Sulfonylureas: Probenecid may increase the serum concentration of Sulfonylureas. Risk C: Monitor therapy
Thiopental: Probenecid may enhance the adverse/toxic effect of Thiopental. Specifically, anesthetic potency and duration may be enhanced. Risk C: Monitor therapy
Urea Cycle Disorder Agents: Probenecid may increase serum concentrations of the active metabolite(s) of Urea Cycle Disorder Agents. Specifically, concentrations of phenylacetate and phenylacetylglutamine may be increased. Risk C: Monitor therapy
Vadadustat: OAT1/3 Inhibitors may increase the serum concentration of Vadadustat. Risk C: Monitor therapy
Zidovudine: Probenecid may increase the serum concentration of Zidovudine. Risk C: Monitor therapy
Probenecid crosses the placenta. Based on available data, an increased risk of adverse fetal events have not been reported (Gutman, 2012).
Drug may cause GI upset; take with food if GI upset. Drink plenty of fluids.
Serum uric acid, kidney function, CBC.
Uric acid, serum:
Adults:
Normal values: 3 to 7 mg/dL (SI: 178.5 to 416.5 micromole/L). Note: Reference ranges may vary depending on the laboratory.
Goal during therapy: <6 mg/dL (SI: <357 micromole/L); <5 mg/dL (SI: <297.5 micromole/L) in patients with severe gout (eg, tophi, frequent attacks, chronic arthropathy) (EULAR [Richette 2017]). Levels <3 mg/dL (SI: <178.5 micromole/L) are not recommended long-term (EULAR [Richette 2017]).
Note: Serum uric acid values >7 mg/dL (SI: >416.5 micromole/L) do not necessarily represent clinical gout; the American College of Rheumatology clinical practice guidelines recommend against initiating pharmacologic management of asymptomatic hyperuricemia (ACR [FitzGerald 2020]).
Competitively inhibits the reabsorption of uric acid at the proximal convoluted tubule, thereby promoting its excretion and reducing serum uric acid levels; increases plasma levels of weak organic acids (penicillins, cephalosporins, or other beta-lactam antibiotics) by competitively inhibiting their renal tubular secretion
Onset of action: Effect on penicillin levels: 2 hours; Uric acid renal clearance: 30 minutes
Absorption: Rapid and complete
Protein binding: 85% to 95%
Metabolism: Hepatic
Half-life elimination (dose dependent): Normal renal function: 6 to 12 hours
Time to peak, serum: 2 to 4 hours
Excretion: Urine
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