Pelvic Inflammatory Disease Medication
- Author: Suzanne Moore Shepherd, MD, MS, DTM&H, FACEP, FAAEM; Chief Editor: Michel E Rivlin, MD more...
Medication Summary
The Centers for Disease Control and Prevention (CDC) has outlined antibiotic regimens for outpatient and inpatient treatment of pelvic inflammatory disease (PID).
Outpatient treatment
For outpatient treatment, there are 2 currently accepted treatment regimens for PID as provided by the CDC, Regimen A and Regimen B.[27]
Regimen A consists of the following:
- Administer ceftriaxone 250 mg IM once as a single dose plus doxycycline 100 mg PO bid for 14 days, with or without metronidazole 500 mg PO bid for 14 days.
- Metronidazole can be added if there is evidence or suspicion of vaginitis or gynecologic instrumentation in the past 2-3 weeks.
Regimen B consists of the following:
- Administer cefoxitin 2 g IM once as a single dose and probenecid 1 g PO concurrently in a single dose or other single-dose parenteral third-generation cephalosporin (ceftizoxime or cefotaxime) plus doxycycline 100 mg PO bid for 14 days with or without metronidazole 500 mg PO bid for 14 days.
- Metronidazole can be added if there is evidence or suspicion for vaginitis or gynecologic instrumentation in the past 2-3 weeks.
Inpatient treatment
For inpatient treatment, there are 2 currently accepted treatment regimens for PID as provided by the CDC, Regimen A and Regimen B.[27]
Regimen A consists of the following:
- Administer cefoxitin 2 g IV q6h or cefotetan 2 g IV q12h plus doxycycline 100 mg PO/IV q12h.
- Continue this regimen for 24 hours after the patient remains clinically improved, and then start doxycycline 100 mg PO bid for a total of 14 days.
- Administer doxycycline PO when possible because of pain associated with infusion. Bioavailability is similar with PO and IV administrations.
- If TOA is present, use clindamycin or metronidazole with doxycycline for more effective anaerobic coverage.
Regimen B consists of the following:
- Administer clindamycin 900 mg IV q8h plus
- Administer gentamicin 2 mg/kg loading dose IV followed by a maintenance dose of 1.5 mg/kg q8h.
- IV therapy may be discontinued 24 hours after the patient improves clinically, and PO therapy of 100 mg bid of doxycycline should be continued for a total of 14 days.
- If TOA is present, use clindamycin or metronidazole with doxycycline for more effective anaerobic coverage.
An alternative parenteral regimen is as follows:
- Ampicillin/sulbactam 3 g IV every 6 hours plus doxycycline 100 mg orally or IV every 12 hours
Additional information on treatment
Oral doxycycline has the same bioavailability as the intravenous form and avoids painful infusion and vein sclerosis. Gentamicin dosing may be every 24 hours. Other third-generation cephalosporins may be substituted for cefoxitin and ceftriaxone.
In individuals who have cephalosporin allergy, spectinomycin is recommended in Europe and Canada; however, this is currently unavailable in the United States. A 2-g azithromycin dose may also be used in this group; however, it is not routinely recommended because of concerns about rapid development of resistance to this antibiotic[48, 49] and potential intolerance of this dose. For more information, see the CDC's Antibiotic-Resistant Gonorrhea Web site and CDC Updated Gonococcal treatment recommendations.
In April 2007, the CDC updated treatment guidelines for gonococcal infection and associated conditions.[50] Fluoroquinolone antibiotics are no longer recommended to treat gonorrhea in the United States. This change is based on an analysis of data from the CDC's Gonococcal Isolate Surveillance Project (GISP). The data from GISP showed that the prevalence of fluoroquinolone-resistant gonorrhea (QRNG) cases in heterosexual men had reached 6.7%, an 11-fold increase from 0.6% in 2001.
This limits the recommended drugs for treatment of gonorrhea to cephalosporins (eg, ceftriaxone 125 mg IM once as a single dose). Fluoroquinolones may be an alternative treatment option for disseminated gonococcal infection if antimicrobial susceptibility can be documented.
Antibiotics
Class Summary
Treatment should include empirical broad-spectrum antibiotics to cover the full complement of common causes. Antibiotic therapy should be effective against gram-negative facultative organisms, anaerobes, and streptococci, as well as against Chlamydia trachomatis and Neisseria gonorrhoeae.
Azithromycin (Zithromax, Zmax)
Azithromycin acts by binding to 50S ribosomal subunit of susceptible microorganisms and blocks dissociation of peptidyl tRNA from ribosomes, causing RNA-dependent protein synthesis to arrest. Nucleic acid synthesis is not affected. This drug concentrates in phagocytes and fibroblasts, as demonstrated by in vitro incubation techniques. In vivo studies suggest that concentration in phagocytes may contribute to drug distribution to inflamed tissues.
Azithromycin is used to treat mild-to-moderate microbial infections. Plasma concentrations are very low, but tissue concentrations are much higher, giving it value in treating intracellular organisms. It has a long tissue half-life.
Azithromycin is related to erythromycin. It is considered by many to be treatment of choice for Chlamydia trachomatis genitourinary infection because it may be administered as 1-dose treatment, which improves adherence to treatment.
Ceftriaxone (Rocephin)
Ceftriaxone is a third-generation cephalosporin with broad-spectrum, gram-negative activity. It has a lower efficacy against gram-positive organisms and higher efficacy against resistant organisms. Its bactericidal activity results from inhibiting cell wall synthesis by binding to one or more penicillin-binding proteins.
Cefoxitin (Mefoxin)
Cefoxitin is a second-generation cephalosporin indicated for infections with gram-positive cocci and gram-negative rods. Infections caused by cephalosporin- or penicillin-resistant gram-negative bacteria may respond to cefoxitin.
Cefotetan (Cefotan)
Cefotetan is a second-generation cephalosporin indicated for infections caused by susceptible gram-positive cocci and gram-negative rods. The dose and route of administration depend on the condition of the patient, the severity of infection, and the susceptibility of the causative organism.
Cefotaxime (Claforan)
Cefotaxime is a third-generation cephalosporin with broad gram-negative spectrum, lower efficacy against gram-positive organisms, and higher efficacy against resistant organisms. It arrests bacterial cell wall synthesis by binding to one or more of the penicillin-binding proteins, which in turn inhibits bacterial growth. Cefotaxime is used for septicemia and treatment of gynecologic infections caused by susceptible organisms.
Doxycycline (Vibramycin)
Doxycycline inhibits protein synthesis and, thus, bacterial growth by binding to 30S and possibly 50S ribosomal subunits of susceptible bacteria.
Clindamycin (Cleocin)
Clindamycin is a lincosamide for treatment of serious skin and soft tissue staphylococcal infections. It is also effective against aerobic and anaerobic streptococci (except enterococci). It inhibits bacterial growth, possibly by blocking dissociation of peptidyl tRNA from ribosomes, causing RNA-dependent protein synthesis to arrest.
Metronidazole (Flagyl)
An imidazole ring–based antibiotic active against various anaerobic bacteria and protozoa, metronidazole is used in combination with other antimicrobial agents (except for Clostridium difficile enterocolitis).
Gentamicin (Garamycin)
Gentamicin is an aminoglycoside antibiotic that provides gram-negative coverage. It is used in combination with an agent against gram-positive organisms and one that covers anaerobes. Dosing regimens are numerous. Adjust dose based on creatinine clearance and changes in volume of distribution. Follow each regimen by at least a trough level drawn on the third or fourth dose (0.5 h before dosing); a peak level may be drawn 0.5 h after 30-min infusion.
Probenecid
Probenecid inhibits tubular secretion of penicillin and usually increases penicillin plasma levels, regardless of the route of penicillin administration. It is used as an adjuvant to therapy with penicillin, ampicillin, methicillin, oxacillin, cloxacillin, or nafcillin. Two- to 4-fold elevation of penicillin plasma levels is demonstrated.
Ampicillin and sulbactam (Unasyn)
This drug combination includes a beta-lactamase inhibitor with ampicillin. It interferes with bacterial cell wall synthesis during active replication, causing bactericidal activity against susceptible organisms.
Ceftizoxime (Cefizox)
Ceftizoxime is a third-generation cephalosporin with broad-spectrum gram-negative activity. It has lower efficacy against gram-positive organisms and higher efficacy against resistant organisms. It arrests bacterial growth by binding to 1 or more penicillin-binding proteins. Gram-negative spectrum includes M catarrhalis. Dose selection depends on the severity of the infection and the susceptibility of the organism.
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