【成份】

本品主要成份为利鲁唑，其化学名称为：2-氯基-6-三氟甲氧基苯并噻唑。

【适应症】

用于肌萎缩侧索硬化症。

【用法用量】

口服，一次1片（50mg），一日2次。增加每日给药剂量不会增加药效，但增加不良反应。如漏服一次，按原计划服用下1片。
餐前或餐后2小时服用，以降低食物对利鲁唑生物利用度的影响。

【药理毒理】

虽然肌萎缩侧索硬化症（ALS）的发病机理尚未完全阐明，但有学说认为谷氨酸（是中枢神经系统主要的兴奋型神经递质）在此疾病中是造成细胞死亡的原因。
利鲁唑的作用机制尚不清楚。利鲁唑通过抑制脑内神经递质（谷氨酸及天冬氨酸）的释放，抑制兴奋性氨基酸的活性及稳定电压依赖性钠通道的失活状态来表现其神经保护作用，多种体外细胞模型均证明了利鲁唑可减少兴奋性递质的毒性作用，增加细胞的存活率。试验表明，ALS患者的脑脊液能降低胎鼠皮质神经元细胞的存活率，5×10-7mol/L的利鲁唑则有效对抗这种作用（细胞存活率从44.7％提高到60.6％）。1×10-4mol/L的利鲁唑可使1×10-4mol/L NMDA作用下的新生大鼠海马CA1锥体神经元细胞的存活率由6％提高到38％。此外整体试验研究中，采用一种表达人突变的Cu/Zn SOD的转基因小鼠为试验模型，利鲁唑以饮水的方式给药，药液浓度为100mg/L，小鼠出生后50天开始饮用。结果表明利鲁唑可明显延缓小鼠的平均死亡时间，生存期增加了13至15天（比对照组增加了11％）。
8mg/kg/day的利鲁唑对大鼠的生殖及发育没有明显影响，对大鼠及家兔子代均无明显致畸作用。孕期大鼠对家兔分别口服给予利鲁唑27mg/kg、60mg/kg，有明显的生育毒性和胚胎毒性；雌性大鼠在孕前、妊娠期及哺乳期单次口服利鲁唑15mg/kg有明显的生殖毒性。体外应用哺乳动物肝脏微粒体酶（S9）进行的体外代谢活化实验表明，利鲁唑没有致突变毒性。体内实验中，利鲁唑对大鼠及小鼠无明显的染色体畸变作用。静脉注射或口服利鲁唑14天到6个月，动物中枢神经系统中神经传递受到过度抑制，主要表现为流涎、共济能力失调，其次为疲惫、活动减少、镇静、嗜睡，最终还可导致死亡。本品的急性毒性也主要表现为对中枢神经系统的损害作用，可对呼吸功能产生影响，甚至可导致动物死亡。

RILUTEK 
(riluzole) Tablets

DESCRIPTION

RILUTEK (riluzole) is a member of the benzothiazole class. The chemical designation for riluzole is 2-amino-6-(trifluoromethoxy)benzothiazole. Its molecular formula is C8H5F3N2OS, and its molecular weight is 234.2. The chemical structure is:

RILUTEK is a white to slightly yellow powder that is very soluble in dimethylformamide, dimethylsulfoxide, and methanol; freely soluble in dichloromethane; sparingly soluble in 0.1 N HCl; and very slightly soluble in water and in 0.1 N NaOH.

Each film-coated tablet for oral use contains 50 mg of riluzole and the following inactive ingredients: anhydrous dibasic calcium phosphate, colloidal silicon dioxide, croscarmellose sodium, hypromellose, magnesium stearate, microcrystalline cellulose, polyethylene glycol, and titanium dioxide.

Indications & Dosage

INDICATIONS

RILUTEK is indicated for the treatment of amyotrophic lateral sclerosis (ALS).

DOSAGE AND ADMINISTRATION

The recommended dosage for RILUTEK is 50 mg taken orally twice daily. RILUTEK should be taken at least 1 hour before or 2 hours after a meal [see CLINICAL PHARMACOLOGY].

Measure serum aminotransferases before and during treatment with RILUTEK [see WARNINGS AND PRECAUTIONS].

HOW SUPPLIED

Dosage Forms And Strengths

Tablets: 50 mg film-coated, capsule-shaped, white, with “RPR 202” on one side.

Storage And Handling

RILUTEK 50 mg tablets are white, capsule-shaped, film-coated, and engraved with “RPR 202” on one side. RILUTEK is supplied in bottles of 60 tablets, NDC 24987-700-60.

Store at controlled room temperature, 20°C to 25°C (68°F to77°F), and protect from bright light.

Manufactured for: Covis Pharmaceuticals, Inc. Cary, NC 27511 USA. Revised: May 2016

Side Effects

SIDE EFFECTS

The following adverse reactions are described below and elsewhere in the labeling:

· Hepatic Injury [see WARNINGS AND PRECAUTIONS]

· Neutropenia [see WARNINGS AND PRECAUTIONS]

· Interstitial lung disease [see WARNINGS AND PRECAUTIONS]

Clinical Trials Experience

Because clinical trials are conducted under widely varying conditions, adverse reaction rates observed in the clinical trials of a drug cannot be directly compared to rates in the clinical trials of another drug and may not reflect the rates observed in practice.

Adverse Reactions In Controlled Clinical Trials

In the placebo-controlled clinical trials in patients with ALS (Study 1 and 2), a total of 313 patients received RILUTEK 50 mg twice daily [see Clinical Studies]. The most common adverse reactions in the RILUTEK group (in at least 5% of patients and more frequently than in the placebo group) were asthenia, nausea, dizziness, decreased lung function, and abdominal pain. The most common adverse reactions leading to discontinuation in the RILUTEK group were nausea, abdominal pain, constipation, and elevated ALT.

There was no difference in rates of adverse reactions leading to discontinuation in females and males. However, the incidence of dizziness was higher in females (11%) than in males (4%). The adverse reaction profile was similar in older and younger patients. There were insufficient data to determine if there were differences in the adverse reaction profile in different races.

Table 1 lists adverse reactions that occurred in at least 2% of RILUTEK-treated patients (50 mg twice daily) in pooled Study 1 and 2, and at a higher rate than placebo.

Table 1: Adverse Reactions in Pooled Placebo-Controlled Trials (Studies 1 and 2) in Patients with ALS

Postmarketing Experience

The following adverse reactions have been identified during postapproval use of RILUTEK. Because these reactions are reported voluntarily from a population of uncertain size, it is not always possible to reliably estimate their frequency or establish a causal relationship to drug exposure.

· Acute hepatitis and icteric toxic hepatitis [see WARNINGS AND PRECAUTIONS]

· Renal tubular impairment

Drug Interactions

DRUG INTERACTIONS

Agents That May Increase Riluzole Blood Concentrations

CYP1A2 inhibitors

Co-administration of RILUTEK (a CYP1A substrate) with CYP1A2 inhibitors was not evaluated in a clinical trial; however, in vitro findings suggest an increase in riluzole exposure is likely. The concomitant use of strong or moderate CYP1A2 inhibitors (e.g., ciprofloxacin, enoxacin, fluvoxamine, methoxsalen, mexiletine, oral contraceptives, thiabendazole, vemurafenib, zileuton) with RILUTEK may increase the risk of RILUTEK-associated adverse reactions [see CLINICAL PHARMACOLOGY].

Agents That May Decrease Riluzole Plasma Concentrations

CYP1A2 inducers

Co-administration of RILUTEK (a CYP1A substrate) with CYP1A2 inducers was not evaluated in a clinical trial; however, in vitro findings suggest a decrease in riluzole exposure is likely. Lower exposures may result in decreased efficacy [see CLINICAL PHARMACOLOGY].

Hepatotoxic Drugs

Clinical trials in ALS patients excluded patients on concomitant medications which were potentially hepatotoxic (e.g., allopurinol, methyldopa, sulfasalazine). RILUTEK-treated patients who take other hepatotoxic drugs may be at an increased risk for hepatotoxicity [see WARNINGS ANDPRECAUTIONS].

Warnings & Precautions

WARNINGS

Included as part of the PRECAUTIONS section.

PRECAUTIONS

Hepatic Injury

Cases of drug-induced liver injury, some of which were fatal, have been reported in patients taking RILUTEK. Asymptomatic elevations of hepatic transaminases have also been reported, and in some patients have recurred upon rechallenge with RILUTEK.

In clinical studies, the incidence of elevations in hepatic transaminases was greater in RILUTEK-treated patients than placebo-treated patients. The incidence of elevations of ALT above 5 times the upper limit of normal (ULN) was 2% in RILUTEK-treated patients. Maximum increases in ALT occurred within 3 months after starting RILUTEK. About 50% and 8% of RILUTEK-treated patients in pooled Studies 1 and 2, had at least one elevated ALT level above ULN and above 3 times ULN, respectively [see Clinical Studies].

Monitor patients for signs and symptoms of hepatic injury, every month for the first 3 months of treatment, and periodically thereafter. The use of RILUTEK is not recommended if patients develop hepatic transaminases levels greater than 5 times the ULN. Discontinue RILUTEK if there is evidence of liver dysfunction (e.g., elevated bilirubin).

Neutropenia

Cases of severe neutropenia (absolute neutrophil count less than 500 per mm³ ) within the first 2 months of RILUTEK treatment have been reported. Advise patients to report febrile illnesses.

Interstitial Lung Disease

Interstitial lung disease, including hypersensitivity pneumonitis, has occurred in patients taking RILUTEK. Discontinue RILUTEK immediately if interstitial lung disease develops.

Nonclinical Toxicology

Carcinogenesis, Mutagenesis, Impairment Of Fertility

Carcinogenesis

Riluzole was not carcinogenic in mice or rats when administered for 2 years at daily oral doses up to 20 and 10 mg/kg/day, respectively, which are approximately equal to the recommended human daily dose (RHDD, 100 mg) on a mg/m² basis.

Mutagenesis

Riluzole was negative in in vitro (bacterial reverse mutation (Ames), mouse lymphoma tk, chromosomal aberration assay in human lymphocytes), and in vivo (rat cytogenetic and mouse micronucleus) assays.

N-hydroxyriluzole, the major active metabolite of riluzole, was positive for clastogenicity in the in vitro mouse lymphoma tk assay and in the in vitro micronucleus assay using the same mouse lymphoma cell line. N-hydroxyriluzole was negative in the HPRT gene mutation assay, the Ames assay (with and without rat or hamster S9), the in vitro chromosomal aberration assay in human lymphocytes, and the in vivo mouse micronucleus assay.

Impairment Of Fertility

When riluzole (3, 8, or 15 mg/kg) was administered orally to male and female rats prior to and during mating and continuing in females throughout gestation and lactation, fertility indices were decreased and embryolethality was increased at the high dose. This dose was also associated with maternal toxicity. The mid dose, a no-effect dose for effects on fertility and early embryonic development, is approximately equal to the RHDD on a mg/m² basis.

Use In Specific Populations

Pregnancy

Risk Summary

There are no studies of RILUTEK in pregnant women, and case reports have been inadequate to inform the drug-associated risk. The background risk for major birth defects and miscarriage in patients with amyotrophic lateral sclerosis is unknown. In the U.S. general population, the background risk of major birth defects and miscarriage in clinically recognized pregnancies is 24% and 15-20%, respectively.

In studies in which riluzole was administered orally to pregnant animals, developmental toxicity (decreased embryofetal/offspring viability, growth, and functional development) was observed at clinically relevant doses [see Data]. Based on these results, women should be advised of a possible risk to the fetus associated with use of RILUTEK during pregnancy.

Data

Animal Data

Oral administration of riluzole (3, 9, or 27 mg/kg/day) to pregnant rats during the period of organogenesis resulted in decreases in fetal growth (body weight and length) at the high dose. The mid dose, a no-effect dose for embryofetal developmental toxicity, is approximately equal to the recommended human daily dose (RHDD, 100 mg) on a mg/m² basis. When riluzole was administered orally (3, 10, or 60 mg/kg/day) to pregnant rabbits during the period of organogenesis, embryofetal mortality was increased at the high dose and fetal body weight was decreased and morphological variations increased at all but the lowest dose tested. The no-effect dose (3 mg/kg/day) for embryofetal developmental toxicity is less than the RHDD on a mg/m² basis. Maternal toxicity was observed at the highest dose tested in rat and rabbit.

When riluzole was orally administered (3, 8, or 15 mg/kg/day) to male and female rats prior to and during mating and to female rats throughout gestation and lactation, increased embryofetal mortality and decreased postnatal offspring viability, growth, and functional development were observed at the high dose. The mid dose, a no-effect dose for pre-and postnatal developmental toxicity, is approximately equal to the RHDD on a mg/m² basis.

Lactation

Risk Summary

It is not known if riluzole is excreted in human milk. Riluzole or its metabolites have been detected in milk of lactating rat. Women should be advised that many drugs are excreted in human milk and that the potential for serious adverse reactions in nursing infants from RILUTEK is unknown.

Females And Males Of Reproductive Potential

In rats, oral administration of riluzole resulted in decreased fertility indices and increases in embryolethality [see Nonclinical Toxicology].

Pediatric Use

Safety and effectiveness of RILUTEK in pediatric patients have not been established.

Geriatric Use

In clinical studies of RILUTEK, 30% of patients were 65 years and over. No overall differences in safety or effectiveness were observed between these subjects and younger subjects, and other reported clinical experience has not identified differences in responses between the elderly and younger patients, but greater sensitivity of some older individuals cannot be ruled out.

Hepatic Impairment

Patients with mild [Child-Pugh's (CP) score A] or moderate (CP score B) hepatic impairment had increases in AUC compared to patients with normal hepatic function. Thus, patients with mild or moderate hepatic impairment may be at increased of adverse reactions. The impact of severe hepatic impairment on riluzole exposure is unknown.

Use of RILUTEK is not recommended in patients with baseline elevation of elevations of serum aminotransferases greater than 5 times upper limit of normal or evidence of liver dysfunction (e.g., elevated bilirubin) [CLINICAL PHARMACOLOGY].

Japanese Patients

Japanese patients are more likely to have higher riluzole concentrations. Consequently, the risk of adverse reactions may be greater in Japanese patients [see CLINICAL PHARMACOLOGY].

Overdosage & Contraindications

OVERDOSE

Reported symptoms of overdose following ingestion of RILUTEK ranging from 1.5 to 3 grams (30 to 60 times the recommended dose) included acute toxic encephalopathy, coma, drowsiness, memory loss, and methemoglobinemia.

No specific antidote for the treatment of RILUTEK overdose is available. For current information on the management of poisoning or overdosage, contact the National Poison Control Center at 1-800-222-1222 or www.poison.org.

CONTRAINDICATIONS

RILUTEK is contraindicated in patients with a history of severe hypersensitivity reactions to riluzole or to any of its components (anaphylaxis has occurred) [see ADVERSE REACTIONS].

Clinical Pharmacology

CLINICAL PHARMACOLOGY

Mechanism Of Action

The mechanism by which riluzole exerts its therapeutic effects in patients with ALS is unknown.

Pharmacodynamics

The clinical pharmacodynamics of riluzole has not been determined in humans.

Pharmacokinetics

Table 2 displays the pharmacokinetic parameters of riluzole.

Table 2: Pharmacokinetic Parameters of Riluzole

Specific Populations

Hepatic Impairment

Compared with healthy volunteers, the AUC of riluzole was approximately 1.7-fold greater in patients with mild chronic hepatic impairment (CP score A) and approximately 3-fold greater in patients with moderate chronic hepatic impairment (CP score B). The pharmacokinetics of riluzole have not been studied in patients with severe hepatic impairment (CP score C) [see Use in Specific Populations].

Race

The clearance of riluzole was 50% lower in male Japanese subjects than in Caucasian subjects, after normalizing for body weight [see Use in Specific Populations].

Gender

The mean AUC of riluzole was approximately 45% higher in female patients than male patients.

Smokers

The clearance of riluzole in tobacco smokers was 20% greater than in nonsmokers.

Geriatric Patients and Patients with Moderate to Severe Renal Impairment

Age 65 years or older, and moderate to severe renal impairment do not have a meaningful effect on the pharmacokinetics of riluzole. The pharmacokinetics of riluzole in patients undergoing hemodialysis are unknown.

Drug Interaction Studies

Drugs Highly Bound To Plasma Proteins

Riluzole and warfarin are highly bound to plasma proteins. In vitro, riluzole did not show any displacement of warfarin from plasma proteins. Riluzole binding to plasma proteins was unaffected by warfarin, digoxin, imipramine and quinine at high therapeutic concentrations in vitro.

Clinical Studies

The efficacy of RILUTEK was demonstrated in two studies (Study 1 and 2) that evaluated RILUTEK 50 mg twice daily in patients with amyotrophic lateral sclerosis (ALS). Both studies included patients with either familial or sporadic ALS, a disease duration of less than 5 years, and a baseline forced vital capacity greater than or equal to 60% of normal.

Study 1 was a randomized, double-blind, placebo-controlled clinical study that enrolled 155 patients with ALS. Patients were randomized to receive RILUTEK 50 mg twice daily (n=77) or placebo (n=78) and were followed for at least 13 months (up to a maximum duration of 18 months). The clinical outcome measure was time to tracheostomy or death.

The time to tracheostomy or death was longer for patients receiving RILUTEK compared to placebo. There was an early increase in survival in patients receiving RILUTEK compared to placebo. Figure 1 displays the survival curves for time to death or tracheostomy. The vertical axis represents the proportion of individuals alive without tracheostomy at various times following treatment initiation (horizontal axis). Although these survival curves were not statistically significantly different when evaluated by the analysis specified in the study protocol (Logrank test p=0.12), the difference was found to be significant by another appropriate analysis (Wilcoxon test p=0.05). As seen in Figure 1, the study showed an early increase in survival in patients given RILUTEK. Among the patients in whom the endpoint of tracheostomy or death was reached during the study, the difference in median survival between the RILUTEK 50 mg twice daily and placebo groups was approximately 90 days.

Figure 1: Time to Tracheostomy or Death in ALS Patients in Study 1 (Kaplan-Meir Curves)

Study 2 was a randomized, double-blind, placebo-controlled clinical study that enrolled 959 patients with ALS. Patients were randomized to RILUTEK 50 mg twice daily (n=236) or placebo (n=242) and were followed for at least 12 months (up to a maximum duration of 18 months). The clinical outcome measure was time to tracheostomy or death.

The time to tracheostomy or death was longer for patients receiving RILUTEK compared to placebo. Figure 2 displays the survival curves for time to death or tracheostomy for patients randomized to either RILUTEK 100 mg per day or placebo. Although these survival curves were not statistically significantly different when evaluated by the analysis specified in the study protocol (Logrank test p=0.076), the difference was found to be significant by another appropriate analysis (Wilcoxon test p=0.05). Not displayed in Figure 2 are the results of RILUTEK 50 mg per day (one-half of the recommended daily dose), which could not be statistically distinguished from placebo, or the results of RILUTEK 200 mg per day (two times the recommended daily dose), which were not distinguishable from the 100 mg per day results. Among the patients in whom the endpoint of tracheostomy or death was reached during the study, the difference in median survival between RILUTEK and placebo was approximately 60 days..

Although RILUTEK improved survival in both studies, measures of muscle strength and neurologicalfunction did not show a benefit.

Figure 2: Time to Tracheostomy or Death in ALS Patients in Study 2 (Kaplan-Meir Curves)”

Medication Guide

PATIENT INFORMATION

Advise patients to inform their healthcare provider if they experience:

· Yellowing of the whites of the eyes [see WARNINGS AND PRECAUTIONS]

· Fever [see WARNINGS AND PRECAUTIONS]

· Respiratory symptoms—for example, dry cough and difficult or labored breathing [seeWARNINGS AND PRECAUTIONS]