Warnings for Miplyffa
Included as part of the PRECAUTIONS section.
Precautions for Miplyffa
Hypersensitivity Reactions
Hypersensitivity reactions such as urticaria and angioedema have been reported in patients treated with MIPLYFFA during Trial 1 [see Clinical Studies]: two patients reported both urticaria and angioedema (6%) and one patient (3%) experienced urticaria alone. The reactions occurred within the first two months of treatment. Discontinue MIPLYFFA in patients who develop severe hypersensitivity reactions. If a mild or moderate hypersensitivity reaction occurs, stop MIPLYFFA and treat promptly. Monitor the patient until signs and symptoms resolve [see ADVERSE REACTIONS].
Embryofetal Toxicity
Based on findings from animal reproduction studies, MIPLYFFA may cause embryofetal harm when administered during pregnancy. In animal reproduction studies, oral administration of arimoclomol to pregnant rats and rabbits resulted in post-implantation loss and structural abnormalities in offspring. These occurred at exposures equal to or greater than 10- and 5-fold, for rats and rabbits respectively, the human exposure at the maximum recommended human daily dose of 372 mg. Advise pregnant females of the potential risk to the fetus. Consider pregnancy planning and prevention for females of reproductive potential [see Use In Specific Populations].
Increased Creatinine Without Affecting Glomerular Function
Across clinical trials of MIPLYFFA consisting of patients with NPC, healthy subjects, and patients with other diseases, there were mean increases in serum creatinine of 10% to 20% compared to baseline. These increases occurred mostly in the first month of MIPLYFFA treatment and were not associated with changes in glomerular function. The increases in serum creatinine may be due to inhibition of renal tubular secretion transporters [see DRUG INTERACTIONS and CLINICAL PHARMACOLOGY].
During MIPLYFFA treatment, use alternative measures that are not based on creatinine to assess renal function such as BUN, cystatin C, or measured GFR. Increases in creatinine reversed upon MIPLYFFA discontinuation [see CLINICAL PHARMACOLOGY].
Patient Counseling Information
Advise the patient and/or caregiver to read the FDA-approved patient labeling (Instructions for Use).
Drug Interactions
Advise the patient to inform his/her healthcare provider if he/she is taking, or plan to take, any prescription or over-the-counter medications and supplements because of the potential for drug interactions [see DRUG INTERACTIONS and CLINICAL PHARMACOLOGY].
Hypersensitivity Reactions
Advise the patient or caregiver to contact his/her healthcare provider immediately if urticaria (hives), shortness of breath, persistent cough, or facial swelling develop in response to MIPLYFFA treatment  [see WARNINGS AND PRECAUTIONS].
Embryofetal Toxicity
MYPLIFFA may cause embryo-fetal harm. Advise the pregnant female of the potential risk to the fetus. Advise a female of reproductive potential and caregiver to inform their healthcare provider of a known or suspected pregnancy [see WARNINGS AND PRECAUTIONS and Use In Specific Populations]. Counsel females of reproductive potential about pregnancy planning and prevention [see Use In Specific Populations].
Infertility
Advise the female and male of reproductive potential that MIPLYFFA may impair fertility [see Use In Specific Populations].
Nonclinical Toxicology
Carcinogenesis, Mutagenesis, Impairment Of Fertility
Carcinogenesis
In a 2-year carcinogenicity study in Han Wistar rats, and a 26-week carcinogenicity study in Transgenic rasH2 mice, oral administration of arimoclomol did not increase the incidence of tumors at systemic exposures that were approximately 8-fold and 11-fold the human exposure, based on AUC at the MRHD.
Mutagenesis
Arimoclomol was not mutagenic or clastogenic in a standard battery of genotoxicity tests (bacterial mutagenicity [Ames], chromosomal aberration in Chinese Hamster Ovary cells, mouse lymphoma forward mutation, mouse and rat bone marrow micronucleus).
Impairment Of Fertility
In a fertility and early embryonic development study in rats, once daily oral arimoclomol doses were administered to males for 4 weeks prior to and throughout mating (for a total of 10 weeks) and to females for 2 weeks prior to mating and to gestation day 6. A reduction in fertility and fecundity indices was noted for both sexes at 9-fold the human exposure, based on AUC at the MRHD. At the same dose level, a reduction in the number of corpora lutea was observed in females, and reduced sperm motility, immotile sperm, reduced sperm count and increased sperm abnormalities were observed in males. A dose-dependent increase in preimplantation loss was noted across all treated groups (equal to or greater than 5-fold the human exposure, based on AUC at the MRHD), which resulted in a reduction in the number of live embryos [see Use In Specific Populations].
Use In Specific Populations
Pregnancy
Risk Summary
Based on findings from animal reproduction studies, MIPLYFFA may cause embryofetal harm when administered during pregnancy. There are no available data on MIPLYFFA use in pregnant females to evaluate a drug-associated risk of major birth defects, miscarriage, or other adverse maternal or fetal outcomes. Advise pregnant females of the potential risk to the fetus.
In animal reproduction studies, oral administration of arimoclomol to pregnant rats and rabbits during organogenesis resulted in post-implantation loss and structural abnormalities in offspring. These occurred at exposures equal to or greater than 10- and 5-fold, in rats and rabbits respectively, the human exposure at the maximum recommended human daily dose of 372 mg (see Data).
The background risk of major birth defects and miscarriage for the indicated population is unknown. All pregnancies have a background risk of birth defect, loss, or other adverse outcomes. In the U.S. general population, the estimated background risk of major birth defects and miscarriage in clinically recognized pregnancies is 2% to 4% and 15% to 20%, respectively.
Data
Animal Data
In an embryofetal development study in pregnant rats, once daily oral doses of arimoclomol were administered throughout organogenesis from gestation day 6 to 17. Increased post-implantation loss was observed at 10-fold the human exposure, based on AUC at the MRHDD, together with increased ossification in the vertebrae and dilated brain ventricles in litters of dams dosed at equal to or greater than 8-fold the human exposure at the MRHDD.
In another embryofetal development study in pregnant rats in which arimoclomol was administered three times-daily throughout organogenesis from gestation day 6 to 17, there was an increase in post-implantation loss and reduced maternal, placental, and fetal weights at 14-fold the human exposure, based on AUC at the MRHD. In addition, fetuses of dams treated at this exposure level exhibited domed craniums, partially split sternum, hydrocephaly, dilated brain ventricles, dilated interventricular foramen, misaligned and misshapen hemicentres and misaligned ossification sites in the sternebrae, misaligned costal cartilage, increased ossification, cerebral and cerebellar hemorrhages, bipartite supraoccipital, large interparietal bone, marked enlargement of the anterior and posterior fontanelles, hyoid bone, meningocele and fusion of the jugal and maxilla.
In an embryofetal development study in pregnant rabbits, arimoclomol was administered once daily by oral gavage throughout organogenesis from gestation day 7 to 19. Increased incidences of minor skeletal variations (bent hyoid and unossified phalanx) were observed at 5-fold the human AUC at the MRHDD, coinciding with an adverse reduction of maternal body weight.
In a pre- and postnatal development study in pregnant rats, oral arimoclomol was administered from gestation day 6 to lactation day 21. Increased embryofetal lethality and reduced pup weight, with a slight reduction in maternal body weight gain, were observed at 10-fold the human AUC at the MRHDD.
Lactation
Risk Summary
There are no data on the presence of arimoclomol in human or animal milk, the effects on the breastfed infant, or the effects on milk production. The developmental and health benefits of breastfeeding should be considered along with the mother’s clinical need for MIPLYFFA and any potential adverse effects on the breastfed infant from MIPLYFFA or from the underlying maternal condition.
Females And Males Of Reproductive Potential
MIPLYFFA may cause embryofetal harm when administered to a pregnant female [see Use In Specific Populations].
Contraception
Females
Consider pregnancy planning and prevention for females of reproductive potential.
Infertility
Based on findings from animal studies, MIPLYFFA may impair fertility in females and males of reproductive potential. In a rat fertility study, oral administration of arimoclomol resulted in decreased male and female fertility at 9-fold and increased pre-implantation loss at 5-fold the human exposure, based on AUC at MRHD. It is not known if these effects are reversible [see Nonclinical Toxicology].
Pediatric Use
The safety and effectiveness of MIPLYFFA in combination with miglustat for the treatment of neurological manifestations of NPC have been established in pediatric patients 2 years of age and older. Use of MIPLYFFA in combination with miglustat for this indication is supported by evidence from a randomized, double-blind, placebo-controlled 12-month trial (Trial 1) [see Clinical Studies].
The safety and effectiveness of MIPLYFFA have not been established in pediatric patients younger than 2 years of age.
Juvenile Animal Toxicity Data
In juvenile toxicity studies in rats, increased incidences of renal pelvic dilatation were observed at all dose levels corresponding to 4-, 7- and 17-fold the human exposure based on AUC at MRHDD after both 2 and 8 weeks of dosing when animals were dosed from postnatal day 7.
Geriatric Use
NPC is largely a disease of pediatric and young adult patients. Clinical trials of MIPLYFFA in combination with miglustat in patients with NPC did not include patients aged 65 years or older.
Renal Impairment
The recommended MIPLYFFA dosage in combination with miglustat in patients with an eGFR 15 mL/minute to < 50 mL/minute is lower than the recommended dosage (less frequent dosing) in patients with normal renal function [see DOSAGE AND ADMINISTRATION]. The recommended dosage of MIPLYFFA in combination with miglustat in patients with an eGFR ≥ 50 mL/minute is the same as the recommended dosage in patients with normal renal function.
Plasma concentrations of arimoclomol increased in patients with eGFR ≥ 15 mL/minute to < 50 mL/minute [see CLINICAL PHARMACOLOGY].
The pharmacokinetics of arimoclomol have not been evaluated in patients with eGFR < 15 mL/minute.