Mechanism of Action
PIVYA is an antibacterial drug
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.
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
|
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.
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.