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ORAL | 2 DOSAGE AND ADMINISTRATION The recommended starting dose of memantine hydrochloride tablets is 5 mg once daily. The dose should be increased in 5 mg increments to 10 mg/day (5 mg twice daily), 15 mg/day (5 mg and 10 mg as separate doses), and 20 mg/day (10 mg twice daily). The minimum recommended interval between dose increases is one week. The dosage shown to be effective in controlled clinical trials is 20 mg/day. Memantine hydrochloride tablets can be taken with or without food. If a patient misses a single dose of memantine hydrochloride tablets, that patient should not double up on the next dose. The next dose should be taken as scheduled. If a patient fails to take memantine hydrochloride tablets for several days, dosing may need to be resumed at lower doses and retitrated as described above. Specific Populations Renal Impairment A target dose of 5 mg twice daily is recommended in patients with severe renal impairment (creatinine clearance of 5 to 29 mL/min based on the Cockcroft-Gault equation). Hepatic Impairment Memantine hydrochloride tablets should be administered with caution to patients with severe hepatic impairment [see Clinical Pharmacology (12.3) ] . May be taken with or without food. (2) Initial dose is 5 mg once daily. Increase dose in 5 mg increments to a maintenance dose of 10 mg twice daily. A minimum of 1 week of treatment with the previous dose should be observed before increasing the dose. (2) Severe renal impairment: recommended dose is 5 mg twice daily. (2)

1 INDICATIONS AND USAGE Memantine hydrochloride tablets are indicated for the treatment of moderate to severe dementia of the Alzheimer’s type. Memantine hydrochloride tablets are an N-methyl-D-aspartate (NMDA) receptor antagonist indicated for the treatment of moderate to severe dementia of the Alzheimer’s type. (1)

4 CONTRAINDICATIONS Memantine hydrochloride tablets are contraindicated in patients with known hypersensitivity to memantine hydrochloride or to any excipients used in the formulation. Memantine hydrochloride tablets are contraindicated in patients with known hypersensitivity to memantine hydrochloride or to any excipients used in the formulation. (4)

16 HOW SUPPLIED/STORAGE AND HANDLING Memantine Hydrochloride Tablets USP, 5 mg, are supplied as orange colored, oblong, biconvex, film-coated tablets debossed “IP 173” on one side and plain on the other side. They are available as follows: Bottles of 30: NDC 53746-173-30 Bottles of 60: NDC 53746-173-60 Bottles of 1000: NDC 53746-173-10 Memantine Hydrochloride Tablets USP, 10 mg, are supplied as gray colored, oblong, biconvex, film-coated tablets debossed “IP 174” on one side and plain on the other side. They are available as follows: Bottles of 30: NDC 53746-169-30 Bottles of 60: NDC 53746-169-60 Bottles of 1000: NDC 53746-169-10 Store Memantine Hydrochloride Tablets, USP at 20° to 25°C (68° to 77°F); excursions permitted between 15° to 30°C (59° to 86°F) [see USP Controlled Room Temperature]. | 6 ADVERSE REACTIONS Most common adverse reactions (≥ 5 % and greater than placebo) are dizziness, headache, confusion and constipation. (6.1) To report SUSPECTED ADVERSE REACTIONS, contact Amneal Pharmaceuticals at 1-877-835-5472 or FDA at 1-800-FDA-1088 or www.fda.gov/medwatch. 6.1 Clinical Trials Experience Memantine hydrochloride was evaluated in eight double-blind placebo-controlled trials involving a total of 1862 dementia (Alzheimer’s disease, vascular dementia) patients (940 patients treated with memantine hydrochloride and 922 patients treated with placebo) for a treatment period up to 28 weeks. 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 clinical practice. Adverse Events Leading to Discontinuation In placebo-controlled trials in which dementia patients received doses of memantine hydrochloride up to 20 mg/day, the likelihood of discontinuation because of an adverse reaction was the same in the memantine hydrochloride group (10.1%) as in the placebo group (11.5%). No individual adverse reaction was associated with the discontinuation of treatment in 1% or more of memantine hydrochloride-treated patients and at a rate greater than placebo. Most Common Adverse Reactions In double-blind placebo-controlled trials involving dementia patients, the most common adverse reactions (incidence ≥ 5% and higher than placebo) in patients treated with memantine hydrochloride were dizziness, headache, confusion and constipation. Table 1 lists all adverse reactions that occurred in at least 2% of patients treated with memantine hydrochloride and at an incidence greater than placebo. Table 1: Adverse Reactions Reported in Controlled Clinical Trials in at Least 2% of Patients Receiving Memantine Hydrochloride and at a Higher Frequency than Placebo-treated Patients Adverse Reaction Placebo (N = 922) % Memantine Hydrochloride (N = 940) % Body as a Whole Fatigue 1 2 Pain 1 3 Cardiovascular System Hypertension 2 4 Central and Peripheral Nervous System Dizziness 5 7 Headache 3 6 Gastrointestinal System Constipation 3 5 Vomiting 2 3 Musculoskeletal System Back pain 2 3 Psychiatric Disorders Confusion 5 6 Somnolence 2 3 Hallucination 2 3 Respiratory System Coughing 3 4 Dyspnea 1 2 The overall profile of adverse reactions and the incidence rates for individual adverse reactions in the subpopulation of patients with moderate to severe Alzheimer’s disease were not different from the profile and incidence rates described above for the overall dementia population. Seizures Memantine hydrochloride has not been systematically evaluated in patients with a seizure disorder. In clinical trials of memantine hydrochloride, seizures occurred in 0.2% of patients treated with memantine hydrochloride and 0.5% of patients treated with placebo. 6.2 Postmarketing Experience The following adverse reactions have been identified during post-approval use of memantine. 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. These reactions include: Blood and Lymphatic System Disorders - agranulocytosis, leukopenia (including neutropenia), pancytopenia, thrombocytopenia, thrombotic thrombocytopenic purpura. Cardiac Disorders - cardiac failure congestive. Gastrointestinal Disorders - pancreatitis. Hepatobiliary Disorders - hepatitis. Psychiatric Disorders - suicidal ideation. Renal and Urinary Disorders - acute renal failure (including increased creatinine and renal insufficiency). Skin Disorders - Stevens Johnson syndrome.