Suction
Aprremilast is well absorbed and its absolute bioavailability after ingestion is approximately 73%. Median time to reach (tmax) the maximum concentration in the blood plasma (Cmax) is approximately 2.5 hours.The pharmacokinetics of apreylast is linear, with an increase in the degree of exposure, in proportion to the dose (within 10-100 mg per day). After taking apromilast 1 time a day, cumulation is minimal, and after applying 2 times a day it is approximately 53% in healthy people and 68% in psoriasis patients. Bioavailability of aphomilast is not disturbed when it is applied to food, so it can be taken regardless of the time of ingestion.
Distribution
Apremilast binds to human plasma proteins by approximately 68%. The average apparent volume of distribution (Vd) is 87 liters, indicating an extravascular distribution.
Biotransformation
Apremilast is extensively metabolized, both with the participation of cytochrome 450 (CYP) isoenzymes and non-CYP pathways, including oxidation, hydrolysis and conjugation. Therefore, inhibition of any one of these pathways should not substantially induce a significant drug interaction. In the oxidative metabolism of apremilast, the isoenzyme CYP3A4 and, to a lesser extent, the isoenzymes CYP1A2 and CYP2A6, are involved. After ingestion, the main component in the blood is aprimilast. The compound is largely metabolized, and only 3% and 7% of the accepted amount of the drug is excreted unchanged by the kidneys and intestines, respectively.In the blood, the basic inactive metabolite is the glucuronide conjugate of O-demethylated apomorphite (Ml2). As aprimilast is a substrate for the isoenzyme CYP3A4, its effect is reduced when used simultaneously with rifampicin, a strong inducer of the isoenzyme CYP3A4.
In vitro aprimilast is not an inhibitor or inducer of CYP450 isoenzymes.
Therefore, when combined with the substrates of CYP450 isoenzymes, aprimilast will not disrupt the clearance or exposure to active substances that are metabolized by CYP450 isoenzymes.
In vitro aprimilast is a substrate and a weak inhibitor of P-glycoprotein (IC50> 50 μM), however clinically significant interactions involving glycoprotein are unlikely.
In vitro aprimilast slightly inhibits or does not affect (IC50> 10 μM) on the carriers of organic anatoms OAT1 and OAT3, the carrier of organic cations OCT2, the transport polypeptide of organic anions (OATP) 1B1 and OATP1B3 or the breast cancer resistance protein (BCRP) and is not a substrate for these compounds . In this regard, clinically significant drug interactions are unlikely with the joint application of apreblast with substrates or inhibitors of these transporters.
Excretion
In healthy people, the clearance of apremilast averages about 10 liters / hour and the final half-life is approximately 9 hours. After ingestion of the labeled compound with kidneys and intestines, approximately 58% and 39% of radioactivity, respectively, are excreted, with approximately 3% and 7% of the dose in the form of a radioactive aprimilast.
Elderly patients
The apremilast was studied in young and elderly healthy volunteers. Exposure of ergilavast in the elderly (65 to 85 years) is approximately 13% higher in terms of the area under the concentration / time curve (AUC) and 6% higher in Cmax in comparison with volunteers aged 18-55 years. Data on the use of the drug in clinical studies in patients older than 75 years are limited. In elderly patients there is no need for dose adjustment.
Renal insufficiency
In patients with mild to moderate renal insufficiency and healthy volunteers, there were no significant differences in the pharmacokinetics of aprimilast. Therefore, with renal failure of mild or moderate severity, a dose change is not required. In severe renal failure (glomerular filtration rate less than 30 ml / min / 1.73 m2 or creatinine clearance <30 mL / min), the dose is reduced to 30 mg once daily. In 8 patients with severe renal insufficiency, with a single dose of apremilast in a dose of 30 mg, the values of AUC and Cmax increased by approximately 89% and 42%, respectively.
Liver failure
The pharmacokinetics of apremilast and its main metabolite M12 is not impaired in patients with moderate or severe hepatic impairment. With hepatic failure, dose adjustment is not required.
Pre-clinical safety study results
The results of the preclinical study of the pharmacology of safety and toxicity with repeated administration of apreylast have not revealed specific risks to humans. Apremilast did not possess immunotoxicity, phototoxicity or irritant effect on the skin.
Fertility and early embryonic development
Apremilast did not affect fertility in male mice. Doses in which there was no apparent side effect (NOAEL) on fertility were more than 50 mg / kg / day (3 times the clinical exposure).
In a combined study of the effect on fertility in female mice and evaluation of embryo-fetal toxicity, prolongation of estrogenic cycles and an increase in the mating period were observed at doses of apremilast 20 mg / kg / day and higher.However, the frequency of pregnancies was not violated. The dose at which there was no visible effect (NOEL) on the fertility of females was 10 mg / kg / day (corresponding to clinical exposure).
Embryo-fetal development
The NOEL value for embryo-fetal development was 10 mg / kg / day (1.3 of the clinical exposure value). In the monkeys aprimilast increased prenatal losses (abortions) in proportion to the dose when administered orally at doses of 50 mg / kg / day or more. At a dose of 20 mg / kg / day, there was no effect on embryo-fetal development (1.4 of the magnitude of clinical exposure).
Pre- and postnatal development
In mice, an increase in the pre- and postnatal death of suckling young and a decrease in their body weight was detected in the first week of lactation at doses ≥ 80 mg / kg / day (≥ 4.0 above the clinical exposure level). There was no effect on the pregnancy rate, the number of pregnant mice at the end of the gestation period, the number of mice born or the development of suckling babies after the 7th postnatal day.
All the undesirable effects on postnatal development were noted during the first week and did not appear in subsequent periods.Sexual maturation, behavior, mating, fertility and uterine parameters were not violated. The NOEL value for female mice and F1 generation was 10 mg / kg / day (1.3 of the clinical exposure value for AUC).
Carcinogenicity studies
Apreemilast showed no signs of endogenicity when studied in mice and rats.
Genotoxicity studies
Aprremilast is not genotoxic. Apremilast did not cause mutations according to the results of the Ames test or chromosomal aberrations in the culture of peripheral blood lymphocytes in the presence or absence of metabolic activation. Apremilast did not exhibit clastogenic activity on micronuclei of mice in vivo in doses up to 2000 mg / kg / day.