Amantadine Hydrochloride (Page 4 of 4)

DOSAGE AND ADMINISTRATION

The dose of amantadine hydrochloride capsules may need reduction in patients with congestive heart failure, peripheral edema, orthostatic hypotension, or impaired renal function (see Dosage for Impaired Renal Function)

Dosage for Prophylaxis and Treatment of Uncomplicated Influenza A Virus Illness

Adult

The adult daily dosage of amantadine hydrochloride capsules is 200 mg; two 100 mg capsules as a single daily dose. The daily dosage may be split into one capsule of 100 mg twice a day. If central nervous system effects develop in once-a-day dosage, a split dosage schedule may reduce such complaints. In persons 65 years of age or older, the daily dosage of amantadine hydrochloride capsules is 100 mg.

A 100 mg daily dose has also been shown in experimental challenge studies to be effective as prophylaxis in healthy adults who are not at high risk for influenza-related complications. However, it has not been demonstrated that a 100 mg daily dose is as effective as a 200 mg daily dose for prophylaxis, nor has the 100 mg daily dose been studied in the treatment of acute influenza illness. In recent clinical trials, the incidence of central nervous system (CNS) side effects associated with the 100 mg daily dose was at or near the level of placebo. The 100 mg dose is recommended for persons who have demonstrated intolerance to 200 mg of amantadine hydrochloride daily because of CNS or other toxicities.

Pediatric Patients

1 yr. to 9 yrs. of age

The total daily dose should be calculated on the basis of 2 to 4 mg/lb/day (4.4 to 8.8 mg/kg/day), but not to exceed 150 mg per day.

9 yrs. to 12 yrs. of age

The total daily dose is 200 mg given as one capsule of 100 mg twice a day. The 100 mg daily dose has not been studied in this pediatric population. Therefore, there are no data which demonstrate that this dose is as effective as or is safer than the 200 mg daily dose in this patient population.

Prophylactic dosing should be started in anticipation of an influenza A outbreak and before or after contact with individuals with influenza A virus respiratory tract illness.

Amantadine hydrochloride capsules should be continued daily for at least 10 days following a known exposure. If amantadine is used chemoprophylactically in conjunction with inactivated influenza A virus vaccine until protective antibody responses develop, then it should be administered for 2 to 4 weeks after the vaccine has been given. When inactivated influenza A virus vaccine is unavailable or contraindicated, amantadine hydrochloride capsules should be administered for the duration of known influenza A in the community because of repeated and unknown exposure.

Treatment of influenza A virus illness should be started as soon as possible, preferably within 24 to 48 hours after onset of signs and symptoms, and should be continued for 24 to 48 hours after the disappearance of signs and symptoms.

Dosage for Parkinsonism

Adult

The usual dose of amantadine hydrochloride capsules is 100 mg twice a day when used alone. Amantadine has an onset of action usually within 48 hours.

The initial dose of amantadine hydrochloride capsules is 100 mg daily for patients with serious associated medical illnesses or who are receiving high doses of other antiparkinson drugs. After one to several weeks at 100 mg once daily, the dose may be increased to 100 mg twice daily, if necessary.

Occasionally, patients whose responses are not optimal with amantadine hydrochloride capsules at 200 mg daily may benefit from an increase up to 400 mg daily in divided doses. However, such patients should be supervised closely by their physicians.

Patients initially deriving benefit from amantadine hydrochloride capsules not uncommonly experience a fall-off of effectiveness after a few months. Benefit may be regained by increasing the dose to 300 mg daily. Alternatively, temporary discontinuation of amantadine hydrochloride capsules for several weeks, followed by reinitiation of the drug, may result in regaining benefit in some patients. A decision to use other antiparkinson drugs may be necessary.

Dosage for Concomitant Therapy

Some patients who do not respond to anticholinergic antiparkinson drugs may respond to amantadine hydrochloride capsules. When amantadine hydrochloride capsules or anticholinergic antiparkinson drugs are each used with marginal benefit, concomitant use may produce additional benefit.

When amantadine and levodopa are initiated concurrently, the patient can exhibit rapid therapeutic benefits. Amantadine hydrochloride capsules should be held constant at 100 mg daily or twice daily while the daily dose of levodopa is gradually increased to optimal benefit.

When amantadine is added to optimal well-tolerated doses of levodopa, additional benefit may result, including smoothing out the fluctuations in improvement which sometimes occur in patients on levodopa alone. Patients who require a reduction in their usual dose of levodopa because of development of side effects may possibly regain lost benefit with the addition of amantadine hydrochloride capsules.

Dosage for Drug Induced Extrapyramidal Reactions

Adult

The usual dose of amantadine hydrochloride capsules is 100 mg twice a day. Occasionally, patients whose responses are not optimal with amantadine hydrochloride capsules at 200 mg daily may benefit from an increase up to 300 mg daily in divided doses.

Dosage for Impaired Renal Function

Depending upon creatinine clearance, the following dosage adjustments are recommended:

CREATININE CLEARANCE
(mL/min/1.73m2)
AMANTADINE
HYDROCHLORIDE
CAPSULES DOSAGE
30 to 50
200 mg 1st day and 100 mg each day thereafter
15 to 29
200 mg 1st day followed by 100 mg on alternate
days
<15
200 mg every 7 days

The recommended dosage for patients on hemodialysis is 200 mg every 7 days.

HOW SUPPLIED

Product: 53002-3750

NDC: 53002-3750-1 10 CAPSULE in a BOTTLE

REFERENCES

  1. W.W. Wilson and A.H. Rajput, Amantadine-Dyazide Interaction, Can Med Assoc J. 129:974-975, 1983.
  2. D.F. Casey, N. Engl. J. Med. 298:516, 1978
  3. C.D. Berkowitz, J. Pediatr. 95:144, 1979.

Manufactured by:

Strides Pharma Science Ltd.

Puducherry – 605014, India

Distributed by:

Strides Pharma Inc.

East Brunswick, NJ 08816

Revised: 08/2019

Amantadine HCl 100mg Capsules, USP

Label Image
(click image for full-size original)
AMANTADINE HYDROCHLORIDE
amantadine hydrochloride capsule
Product Information
Product Type HUMAN PRESCRIPTION DRUG Item Code (Source) NDC:53002-3750(NDC:42543-493)
Route of Administration ORAL DEA Schedule
Active Ingredient/Active Moiety
Ingredient Name Basis of Strength Strength
AMANTADINE HYDROCHLORIDE (AMANTADINE) AMANTADINE HYDROCHLORIDE 100 mg
Inactive Ingredients
Ingredient Name Strength
STARCH, CORN
CROSCARMELLOSE SODIUM
FD&C BLUE NO. 1
FD&C RED NO. 40
GELATIN, UNSPECIFIED
MAGNESIUM STEARATE
MICROCRYSTALLINE CELLULOSE
SODIUM LAURYL SULFATE
TITANIUM DIOXIDE
ETHYLCELLULOSE (7 MPA.S)
POTASSIUM HYDROXIDE
PROPYLENE GLYCOL
SHELLAC
AMMONIA
Product Characteristics
Color RED (RED CHERRY) Score no score
Shape CAPSULE Size 18mm
Flavor Imprint Code S;493
Contains
Packaging
# Item Code Package Description Multilevel Packaging
1 NDC:53002-3750-1 10 CAPSULE in 1 BOTTLE None
Marketing Information
Marketing Category Application Number or Monograph Citation Marketing Start Date Marketing End Date
ANDA ANDA209047 07/31/2017
Labeler — RPK Pharmaceuticals, Inc. (147096275)
Establishment
Name Address ID/FEI Operations
RPK Pharmaceuticals, Inc. 147096275 RELABEL (53002-3750), REPACK (53002-3750)

Revised: 12/2020 RPK Pharmaceuticals, Inc.

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