Aromatic Amino Acid Decarboxylation Inhibitor

DOPA Decarboxylase Inhibitors

Aromatic Amino Acid

Parkinson Disease

<section class="Section" data-sectioncode="34089-3"><a name="section-10"></a><h1>11 DESCRIPTION</h1>DUOPA is a combination of carbidopa, an inhibitor of aromatic amino acid decarboxylation, and levodopa, an aromatic amino acid. Carbidopa is a white, crystalline compound, slightly soluble in water, with a molecular weight of 244.2. It is designated chemically as (2S)-3-(3,4-dihydroxyphenyl)-2-hydrazino-2-methylpropanoic acid monohydrate. Its empirical formula is C10H14N2O4•H2O, and its structural formula is: <img alt="carbidopa chem structure" src="duopa-01.jpg"/>The content of carbidopa in DUOPA is expressed in terms of anhydrous carbidopa which has a molecular weight of 226.3. The 4.63 mg/mL of anhydrous carbidopa is equivalent to 5.0 mg/mL of carbidopa. Levodopa is a white, crystalline compound, slightly soluble in water, with a molecular weight of 197.2. It is designated chemically as (2S)-2-Amino-3-(3,4-dihydroxyphenyl) propanoic acid. Its empirical formula is C9H11NO4, and its structural formula is: <img alt="levodopa chem structure" src="duopa-02.jpg"/>The inactive ingredients in DUOPA are carmellose sodium and purified water. </section>

Duopa

carbidopa / levodopa

carbidopa 4.63 MG/ML / levodopa 20 MG/ML Oral Suspension

carbidopa 4.63 MG/ML / levodopa 20 MG/ML Oral Suspension [Duopa]

carbidopa

levodopa

Psoriasis (PsO)

Psoriatic Arthritis (PsA)

Ankylosing Spondylitis (AS)

Nonradiographic Axial Spondyloarthritis

Taltz

Juvenile Idiopathic Arthritis

Hidradenitis Suppurativa (HS)

Cosentyx

Siliq

Tremfya

Crohn's Disease (CD)

Ulcerative Colitis (UC)

Stelara

Skyrizi

Ilumya

Migraine

Cluster Headache

Migraine Prevention

Emgality

Qulipta

Acute Migraine

Ubrelvy

Nurtec ODT

Vyepti

Aimovig

Ajovy

Breast Cancer: HR+ (HER2-)

Verzenio

Ibrance

Kisqali

Atopic Dermatitis (Eczema)

Cibinqo

Eucrisa

Asthma (injectable)

Asthma OCS Dependent

Nasal Polyposis

Eosinophilic Esophagitis (EoE)

Prurigo Nodularis

Dupixent

Opzelura

Adbry

NSCLC ALK+ OR ROS1+ Disease

Lorbrena

Alecensa

Alunbrig

NSCLC cMET Mutation

Xalkori

Rheumatoid Arthritis (RA)

Xeljanz

Uveitis

Graft Versus Host Disease (GVHD)

Orencia

COVID-19 Treatment

Alopecia Areata

Olumiant

Multiple Sclerosis (MS)

Secondary Progressive Multiple Sclerosis

Zeposia

Rinvoq

Entyvio

Report Adverse Event 

Prescribing Information 

Medication Guide 

Submit MSL Request 

Pharmacy List

Coverage Authorization Request 

Coverage Authorization Appeals 

Duopa Prescription & Enrollment Form 

Enroll in Patient Savings Program 

About Duopa 

Patient Stories 

Patient Resources

Duopa Daily Tracker

Patient Decision Brochure

Daily Guide For Duopa

Peer Mentor Program

Instructions For Use: Parkinson's Disease 