Ropinirole Hydrochloride (Page 4 of 9)

7 DRUG INTERACTIONS

7.1 CYP1A2 Inhibitors and Inducers

In vitro metabolism studies showed that CYP1A2 is the major enzyme responsible for the metabolism of ropinirole. There is thus the potential for inducers or inhibitors of this enzyme to alter the clearance of ropinirole. Therefore, if therapy with a drug known to be a potent inducer or inhibitor of CYP1A2 is stopped or started during treatment with ropinirole hydrochloride, adjustment of the dose of ropinirole hydrochloride may be required. Coadministration of ciprofloxacin, an inhibitor of CYP1A2, increases the AUC and C max of ropinirole [see Clinical Pharmacology ( 12.3)]. Cigarette smoking is expected to increase the clearance of ropinirole since CYP1A2 is known to be induced by smoking [see Clinical Pharmacology ( 12.3)].

7.2 Estrogens

Population pharmacokinetic analysis revealed that higher doses of estrogens (usually associated with hormone replacement therapy [HRT]) reduced the clearance of ropinirole. Starting or stopping HRT may require adjustment of dosage of ropinirole hydrochloride [see Clinical Pharmacology ( 12.3)] .

7.3 Dopamine Antagonists

Because ropinirole is a dopamine agonist, it is possible that dopamine antagonists such as neuroleptics (e.g., phenothiazines, butyrophenones, thioxanthenes) or metoclopramide may reduce the efficacy of ropinirole hydrochloride.

8 USE IN SPECIFIC POPULATIONS

8.1 Pregnancy

Pregnancy Category C. There are no adequate and well-controlled studies in pregnant women. In animal reproduction studies, ropinirole has been shown to have adverse effects on embryo-fetal development, including teratogenic effects. Ropinirole hydrochloride should be used during pregnancy only if the potential benefit outweighs the potential risk to the fetus.

Oral treatment of pregnant rats with ropinirole during organogenesis resulted in decreased fetal body weight, increased fetal death, and digital malformations at 24, 36, and 60 times, respectively, the maximum recommended human dose (MRHD) for Parkinson’s disease (24 mg/day) on a mg/m 2 basis. The combined oral administration of ropinirole at 8 times the MRHD and a clinically relevant dose of L-dopa to pregnant rabbits during organogenesis produced a greater incidence and severity of fetal malformations (primarily digit defects) than were seen in the offspring of rabbits treated with L-dopa alone. No effect on fetal development was observed in rabbits when ropinirole was administered alone at an oral dose 16 times the MRHD on a mg/m 2 basis. In a perinatal-postnatal study in rats, impaired growth and development of nursing offspring and altered neurological development of female offspring were observed when dams were treated with 4 times the MRHD on a mg/m 2 basis.

8.3 Nursing Mothers

Ropinirole inhibits prolactin secretion in humans and could potentially inhibit lactation. Ropinirole has been detected in rat milk. It is not known whether this drug is excreted in human milk. Because many drugs are excreted in human milk, caution should be exercised when ropinirole hydrochloride is administered to a nursing woman.

8.4 Pediatric Use

Safety and effectiveness in pediatric patients have not been established.

8.5 Geriatric Use

Dose adjustment is not necessary in elderly (65 years and older) patients, as the dose of ropinirole hydrochloride is individually titrated to clinical therapeutic response and tolerability . Pharmacokinetic trials conducted in patients demonstrated that oral clearance of ropinirole is reduced by 15% in patients older than 65 years compared with younger patients [see Clinical Pharmacology ( 12.3)] .

In clinical trials of extended-release ropinirole for Parkinson’s disease, 387 patients were 65 years and older and 107 patients were 75 years and older. Among patients receiving extended-release ropinirole, hallucination was more common in elderly patients (10%) compared with non-elderly patients (2%). The incidence of overall adverse reactions increased with increasing age for both patients receiving extended-release ropinirole and placebo.

8.6 Renal Impairment

No dose adjustment is necessary in patients with moderate renal impairment (creatinine clearance of 30 to 50 mL/min). For patients with end-stage renal disease on hemodialysis, a reduced maximum dose is recommended [see Dosage and Administration ( 2.2, 2.3), Clinical Pharmacology ( 12.3)] .

The use of ropinirole hydrochloride in patients with severe renal impairment (creatinine clearance less than 30 mL/min) without regular dialysis has not been studied.

8.7 Hepatic Impairment

The pharmacokinetics of ropinirole have not been studied in patients with hepatic impairment.

10 OVERDOSAGE

The symptoms of overdose with ropinirole hydrochloride are generally related to its dopaminergic activity. General supportive measures are recommended. Vital signs should be maintained, if necessary.

In the Parkinson’s disease program, there have been patients who accidentally or intentionally took more than their prescribed dose of ropinirole. The largest overdose reported with ropinirole in clinical trials was 435 mg taken over a 7-day period (62.1 mg/day). Of patients who received a dose greater than 24 mg/day, reported symptoms included adverse events commonly reported during dopaminergic therapy (nausea, dizziness), as well as visual hallucinations, hyperhidrosis, claustrophobia, chorea, palpitations, asthenia, and nightmares. Additional symptoms reported for doses of 24 mg or less or for overdoses of unknown amount included vomiting, increased coughing, fatigue, syncope, vasovagal syncope, dyskinesia, agitation, chest pain, orthostatic hypotension, somnolence, and confusional state.

11 DESCRIPTION

Ropinirole tablets contain ropinirole, a non-ergoline dopamine agonist, as the hydrochloride salt. The chemical name of ropinirole hydrochloride is 4-[2-(dipropylamino)ethyl]-1,3-dihydro-2H-indol-2-one and the empirical formula is C 16 H 24 N 2 OHCl. The molecular weight is 296.84 (260.38 as the free base).

The structural formula is:

structural formula

Ropinirole hydrochloride is a white to yellow solid with a melting range of 243° to 250°C and a solubility of 133 mg/mL in water.

Each round biconvex film-coated ropinirole hydrochloride tablet contains 0.29 mg, 0.57 mg, 1.14 mg, 2.28 mg, 3.42 mg, 4.56 mg, or 5.70 mg ropinirole hydrochloride equivalent to ropinirole, 0.25 mg, 0.5 mg, 1 mg, 2 mg, 3 mg, 4 mg, or 5 mg. Inactive ingredients of the core tablets consist of croscarmellose sodium, hydroxypropyl cellulose, lactose monohydrate, magnesium stearate, microcrystalline cellulose. Inactive ingredients of the film coats are slightly different among the 7 strengths of tablets and are tabulated below:

Strength

Inactive ingredients of the film coat

0.25 mg

polyethylene glycol, polyvinyl alcohol-part. hydrolyzed, talc, titanium dioxide and lecithin (soya).

0.5 mg

polyethylene glycol, polyvinyl alcohol-part. hydrolyzed, talc, titanium dioxide and iron oxide yellow.

1 mg

polyethylene glycol, polyvinyl alcohol-part. hydrolyzed, talc, titanium dioxide, FD&C Blue No. 2 aluminum lake and iron oxide yellow.

2 mg

polyethylene glycol, polyvinyl alcohol-part. hydrolyzed, talc, titanium dioxide, lecithin (soya) and iron oxide red.

3 mg

polyethylene glycol, polyvinyl alcohol-part. hydrolyzed, talc, titanium dioxide, carmine and FD&C Blue No. 1 aluminum lake.

4 mg

polyethylene glycol, polyvinyl alcohol-part. hydrolyzed, talc, titanium dioxide, iron oxide yellow and iron oxide red.

5 mg

polyethylene glycol, polyvinyl alcohol-part. hydrolyzed, talc, titanium dioxide, FD&C Blue No. 2 aluminum lake and lecithin (soya).

USP dissolution test is pending.

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