About Pivya

PIVYA (pivmecillinam) is a prodrug of mecillinam (the active antibacterial agent). Mecillinam is a beta-lactam antibacterial drug with a targeted spectrum of activity. It is mainly active against gram-negative bacteria and works by interfering with the biosynthesis of the bacterial cell wall. Unlike the majority of other beta-lactam agents, which preferentially bind gram-negative PBP-1A, -1B or -3, mecillinam exerts high specificity against penicillin-binding protein 2 (PBP-2) in the gram-negative cell wall.

Indications and Usage
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Indications

PIVYA is indicated for the treatment of female patients 18 years of age and older with uncomplicated urinary tract infections (uUTI) caused by susceptible isolates of Escherichia coli (E. coli), Proteus mirabilis, and Staphylococcus saprophyticus

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Usage

To reduce the development of drug-resistant bacteria and maintain the effectiveness of PIVYA and other antibacterial drugs, PIVYA should be used only to treat or prevent infections that are proven or strongly suspected to be caused by susceptible bacteria. When culture and susceptibility information are available, they should be considered in selecting or modifying antibacterial therapy. In the absence of such data, local epidemiology and susceptibility patterns may contribute to the empiric selection of therapy.

Dosage and Administration
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Dosage

The recommended dosage of Pivya is one 185 mg tablet taken orally three times a day for a period of 3 to 7 days, as clinically indicated. Administer PIVYA with or without food. If a PIVYA is missed, instruct patients to take the dose as soon as possible. Do not double the dose to make up for the missed dose.

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How Supplied

PIVYA tablets are supplied as 185 mg pivmecillinam tablets, film-coated in child-resistant aluminum-aluminum push-through blisters.ss

Available pack sizes: 9 tablets (1 blister sheet with 9 tablets) NDC: 82546-200-09.

The tablet is white, circular, film-coated, debossed with "P" on one side and blank on the other.

Size: Approx. 9.5 mm in diameter.

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Storage and Handling

Store PIVYA tablets at 20 oC to 25 oC (68 oF to 77 oF); excursions permitted between 15°C to 30°C (59°F to 86°F) [See USP Controlled Room Temperature]. Store and dispense tablets in the unit-dose blisters.

CLINICAL PHARMACOLOGY
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Mechanism of Action

PIVYA is an antibacterial drug 

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Pharmacodynamics

Like other beta-lactam antibacterial drugs, the bacteriological effect of PIVYA in the treatment of uUTI is dependent on time above minimum inhibitory concentration (MIC), which has been shown to best correlate with efficacy in animal models of infection against E. coli.

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Pharmacokinetics

Pivmecillinam is a pro-drug of mecillinam (the active antibacterial moiety). The pharmacokinetic information for mecillinam from published studies is summarized in Table.

TABLE: Summary of Pharmacokinetic Parameters and Properties of Mecillinam in
Healthy Females Receiving a Single Dose of 185 mg Pivmecillinam
Exposure (Day 1)
Parameter Value (Mean ± SD)
C max (mcg/mL) 1.7 ± 1.1
AUC 0–8 hours (mcg·min/mL) 214 ± 44
Accumulation No clinically significant accumulation
Absorption
Oral bioavailability of mecillinam* 25–35%
T max (min) 90 ± 33
Effect of food No clinically significant effect on Mecillinam PK
Distribution
% plasma protein binding <25%
Apparent volume of distribution (L) 51
Elimination
Oral clearance (mL/min) 580 ± 100
Metabolism
Metabolic pathways • Pivmecillinam is converted to mecillinam (active antibacterial moiety)
and pivalic acid by non-specific esterases.
• Mecillinam undergoes minimal metabolism.
Excretion
Major route of elimination Urinary excretion, primarily as mecillinam (80% of dose)

C max = maximum plasma concentration; AUC 0–8 hours = area under the plasma concentration-time curve from time zero to 8 hours; T max = time to C max
* Bioavailability estimate based on comparison of dose-normalized mecillinam exposure after 185 mg oral pivmecillinam administration and 200 mg IV mecillinam.
** Excretion estimate based on PK data following intravenous administration of mecillinam

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Specific Populations

The effect of age, sex, race and body weight on pivmecillinam or mecillinam pharmacokinetics is unknown.

Patients with Hepatic Impairment

The effects of hepatic impairment on the pharmacokinetics of mecillinam have not been evaluated. Hepatic impairment is not expected to alter the elimination of mecillinam as hepatic metabolism/excretion represents a minor pathway of elimination for mecillinam. Dosage adjustments are not necessary in patients with impaired hepatic function.

Patients with Renal Impairment

In published pharmacokinetic studies, mecillinam systemic elimination and urinary excretion decreases with degree of renal function.

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Drug Interaction Studies

Clinical Studies

OAT1/3 inhibitors

Mean mecillinam Cmax increased by approximately 80% and AUC by approximately 40% following concomitant use of oral probenecid (OAT1/3 inhibitor) with pivmecillinam in two published studies.

MATE1 or MATE2K inhibitors

The effect of concomitant use on pivmecillinam or mecillinam pharmacokinetics is unknown. In Vitro Studies Where Drug Interaction Potential Was Not Further Evaluated Clinically.

Cytochrome P450 (CYP) enzymes

Mecillinam does not inhibit nor induce CYP 1A1, 1A2, 2A6, 2B6, 2C8, 2C9, 2C19, 2D6, or 3A4/5.

Transporter systems

Mecillinam is a substrate of the renal transporters organic anion transporter-3 (OAT3), multidrug and extrusion protein-1 (MATE1), multidrug and extrusion protein-2K (MATE2-K). Mecillinam does not inhibit breast cancer resistance protein (BCRP), P-glycoprotein (PgP), MATE1, MATE2-K, organic anion transporter-1 (OAT1), OAT3, organic anion transporting polypeptides -1B1 and 1B3 (OATP1B1/B3), and organic cation transporter-2 (OCT2) drug transporters.

Microbiology
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Microbiology

Pivmecillinam is the pro-drug containing the pivaloyloxymethylester of the amidinopenicillanic acid, mecillinam. Orally administered, pivmecillinam is well absorbed and subsequently rapidly hydrolyzed to mecillinam, the active antibacterial agent, by non-specific esterases present in blood, gastrointestinal mucosa and other tissues. Mecillinam is a beta-lactam antibacterial drug with a targeted spectrum of activity. It is mainly active against gram-negative bacteria and works by interfering with the biosynthesis of the bacterial cell wall. Unlike the majority of other beta-lactam agents, which preferentially bind gram-negative PBP-1A, -1B or -3, mecillinam exerts high specificity against penicillin-binding protein 2 (PBP-2) in the gram-negative cell wall.

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Resistance

Mecillinam demonstrated in vitro activity against Enterobacterales in the presence of some beta-lactamases and extended-spectrum beta-lactamases (ESBL) of the following groups: CTX-M, SHV, TEM and AmpC. The inhibitory action of mecillinam on PBP-2 results in low cross-resistance with certain beta-lactams. The frequency of resistance to mecillinam in E. colir ange from 8×10 -8 to 2×10 -5 when exposed to 32-256 times MIC.

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Interaction With Other Antimicrobials

PIVYA has demonstrated synergy with other beta-lactams. In vitro antagonism has been shown with nitrofurantoin.

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Antimicrobial Activity

PIVYA has been shown to be active against most isolates of the following microorganisms both in vitro and in clinical infections

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Aerobic Bacteria
Gram-negative Bacteria
  • Escherichia coli
  • Proteus mirabilis
Gram-positive Bacteria
  • Staphylococcus saprophyticus

The following in vitro data are available, but their clinical significance is unknown. At least 90 percent of the following bacteria exhibit an in vitro minimum inhibitory concentration (MIC) less than or equal to the susceptible breakpoint for PIVYA against isolates of similar genus or organism group. However, the efficacy of PIVYA in treating clinical infections caused by these bacteria has not been established in adequate and well-controlled clinical trials.

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Aerobic Bacteria
Gram-negative Bacteria
  • Citrobacter freundii
  • Enterobacter cloacae
  • Klebsiella pneumoniae
  • Klebsiella aerogenes
  • Klebsiella oxytoca
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Susceptibility Testing

For specific information regarding susceptibility test interpretive criteria, and associated test methods and quality control standards recognized by FDA for this drug,
Please see https://www.fda.gov/STIC .

NONCLINICAL TOXICOLOGY
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Carcinogenesis

Carcinogenicity studies have not been conducted with pivmecillinam or mecillinam.

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Mutagenesis

Pivmecillinam was mutagenic in the Ames bacterial reverse mutation assay. Pivmecillinam induced chromosome breaks in cultured human lymphocytes, but did not induce damage to mouse bone marrow cell chromosomes in vivo. The positive findings observed in the in vitro studies are considered to be due to the release of formaldehyde from the pivoxil ester moiety of pivmecillinam because they were not observed when mecillinam was tested in the same assays. The positive findings are not considered relevant to the clinical use of PIVYA because the small amount of formaldehyde released is eliminated quickly in vivo, but not in vitro.

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Impairment of Fertility

Mecillinam had no adverse effect on fertility in male or female rats at subcutaneous doses up to 450 mg/kg/day (approximately 7.9-fold higher than the maximum recommended daily human dose based on body surface area). Pivmecillinam had no adverse effect on fertility in male or female rats at oral doses up to 582 mg/kg/day (approximately 10.2-fold higher than the maximum recommended daily human dose based on body surface area).

Clinical Studies

Three controlled clinical trials comparing different PIVYA dosing regimens to placebo (Trial 1), to another oral antibacterial drug (Trial 2), or to ibuprofen (Trial 4) evaluated the efficacy of pivmecillinam for the treatment of uUTI. Efficacy was assessed in the Microbiological Intent-to-Treat (micro-ITT) population which included all randomized subjects with a positive baseline urine culture defined as ≥10 5 colony-forming-units (CFU)/mL of a uropathogen where CFU count was available and no more than 2 species of microorganisms, regardless of colony count, and no baseline pathogen was non-susceptible to the active comparator. The composite response rates (composite endpoint of clinical cure and microbiological response), as well as clinical cure and microbiological response rates of the recommended 185 mg three times daily dosing regimen are summarized in Table 1, Table 2 and Table 3.

TABLE 1: Composite Response Rates (Clinical Cure and Microbiological Response) at TOC in the uUTI trials (Micro-ITT Population)
Composite Response Rates
(Clinical Cure and Microbiological Response)
Trial 1 PIVYA
N=137,
n(%)
Placebo
N=134,
n(%)
Difference (95% CI)
85 (62) 85 (62) 52 (41,62)
Trial 2 PIVYA
N=127,
n(%)
Cephalexin
N=132,
n(%)
91 (72) 100 (76) -4 (-16, +7)
Trial 4 PIVYA
N=105,
n(%)
Ibuprofen
N=119,
n(%)
69 (66) 26 (22) 44 (31, 57)
TABLE 2: Table 2 Clinical Cure Rates (Micro-ITT Population) at TOC in the uUTI trials
Clinical Cure Rates
Trial 1 PIVYA
N=137,
n(%)
Placebo
N=134,
n(%)
Treatment Difference (95% CI)
87 (64) 31 (23) 40 (29, 52)
Trial 2 PIVYA
N=127,
n(%)
Cephalexin
N=132,
n(%)
105 (83) 112 (85) -2 (-12, +8)
Trial 4 PIVYA
N=105,
n(%)
Ibuprofen
N=119,
n(%)
81 (77) 45 (38) 39 (27, 52)
TABLE 3 : Microbiological Response Rates (Micro-ITT Population) at TOC in the uUTI trials
Clinical Cure Rates
Trial 1 PIVYA
N=137,
n(%)
Placebo
N=134,
n(%)
Treatment Difference (95% CI)
119 (87) 35 (26) 61 (51,71)
Trial 2 PIVYA
N=127,
n(%)
Cephalexin
N=132,
n(%)
97 (76) 106 (80) -4 (-15, +7)
Trial 4 PIVYA
N=105,
n(%)
Ibuprofen
N=119,
n(%)
78 (74) 64 (54) 21 (7, 34)