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Wilson Disease Treatments Compared

Name: Wilson Disease Treatments Compared
Creator: Jason Hunter
Published: 2026-10-12

4 FDA-approved drugs, side by side from the current prescribing labels. Newest label Jan 2026. Checked October 12, 2026.

Chelators that pull copper outCuprimine, Depen · Syprine · Cuvrior

Zinc, for maintenanceGalzin

Four medicines are FDA approved for Wilson disease: penicillamine (Cuprimine, Depen and generics), trientine hydrochloride (Syprine and generics), Cuvrior (trientine tetrahydrochloride) and Galzin (zinc acetate). Penicillamine and the 2 trientines are chelators that pull copper out through the urine; Galzin blocks copper from being absorbed and is approved only for maintenance after chelation. Each has a different approved use, so they are not simple swaps. All are pills taken on an empty stomach, and treatment is lifelong.

Side by side

4 approved Wilson disease treatments at a glance

How each drug is given, how often, who it is approved for and when it was first approved, from the current FDA label.

Wilson Disease treatments compared: route, schedule, approved use and approval date
Drug	How it is given	How often	Approved for	First approved
Cuprimine, Depen penicillamine (generics available) Bausch Health (Cuprimine); Viatris (Depen); generics	Capsule (Cuprimine) or tablet (Depen) by mouth	0.75 to 1.5 g a day, split into more than 1 dose above 500 mg; on an empty stomach, 1 hour before or 2 hours after meals and 1 hour apart from other medicines, food or milk; with a daily vitamin B6 supplement	Wilson disease, and also cystinuria and severe rheumatoid arthritis	December 4, 1970
Syprine trientine hydrochloride (generics available) Bausch Health; generics	Capsule by mouth 2 to 4 times a day	Adults 750 to 1,250 mg a day and children 500 to 750 mg a day to start, up to 2,000 mg for adults or 1,500 mg for children 12 and under; on an empty stomach; capsules kept in the refrigerator	Wilson disease in people who cannot tolerate penicillamine	November 8, 1985
Cuvrior trientine tetrahydrochloride Orphalan	Tablet by mouth twice a day	300 to 3,000 mg a day in 2 doses on an empty stomach, 1 hour before or 2 hours after meals; switching from penicillamine uses a conversion table in the label	Adults with stable Wilson disease who are already de-coppered and tolerate penicillamine	April 28, 2022
Galzin zinc acetate Eton Pharmaceuticals	Capsule by mouth 3 times a day	50 mg of zinc 3 times a day for adults; 25 mg 3 times a day can work for children 10 and older and during pregnancy; on an empty stomach, 1 hour before or 2 to 3 hours after meals	Maintenance treatment after a person has first been treated with a chelator	January 28, 1997

The calendar

A year on each Wilson disease treatment

Every dose in a year, drawn to the label schedule, so you can see at a glance how often each one is given.

Cuprimine, Depen

By mouth, at home

0.75 to 1.5 g a day, split into more than 1 dose above 500 mg (no fixed yearly count)

Syprine

By mouth, at home

Adults 750 to 1,250 mg a day and children 500 to 750 mg a day to start, up to 2,000 mg f... (no fixed yearly count)

Cuvrior

By mouth, at home

300 to 3,000 mg a day in 2 doses on an empty stomach, 1 hour before or 2 hours after meals (no fixed yearly count)

Galzin

By mouth, at home

50 mg of zinc 3 times a day for adults (no fixed yearly count)

Counts follow the label schedule for a full year on the maintenance dose. Drugs given in cycles or adjusted to blood tests have no fixed count, so their schedule is written out instead.

The evidence

What the pivotal Wilson disease trials showed

The primary result from the trial each FDA approval rests on, as reported on the label.

Before you compare

How to read the Wilson disease trial results

1
Each one is approved for a different job
Penicillamine is approved for Wilson disease in general. Syprine is for people who cannot tolerate penicillamine. Cuvrior is for adults who are already stable and de-coppered on penicillamine. Galzin is for maintenance after a chelator, not for the first treatment of someone with symptoms.
2
No trial has compared them as a first treatment
The AASLD guidance notes that no head-to-head trial has compared penicillamine and trientine as the first treatment. Cuvrior's trial switched stable adults off penicillamine for 24 weeks, which shows how it does as maintenance, not as a starting drug.
3
Side effect numbers are not like for like
Penicillamine's rates come from rheumatoid arthritis studies, Cuvrior's from a 26-person trial against penicillamine, and Syprine's and Galzin's labels list side effects without rates. Use the lists to know what to watch for, not to rank the medicines.
4
Timing around food matters for all 4
Each label asks for an empty stomach, about 1 hour before or 2 hours after meals, and penicillamine and the trientines also need space from other medicines, milk or minerals. Missing doses lets copper build up again.

Wilson Disease pivotal trial results by drug
Drug	Pivotal trial	Primary result
Cuprimine, Depen penicillamine (generics available) Bausch Health (Cuprimine); Viatris (Depen); generics	The label describes no Wilson disease trial; its side effect rates come from 17 rheumatoid arthritis studies of 1,270 people	The label sets the dose by urine copper: a starting dose that removes more than 2 mg of copper in 24 hours, then free copper in the blood under 10 mcg/dL on maintenance
Syprine trientine hydrochloride (generics available) Bausch Health; generics	2 studies of 41 people aged 6 to 54 who could not tolerate penicillamine	The label says clinical experience is limited and the best dose has not been well defined; the dose is raised only if free copper in the blood stays above 20 mcg/dL
Cuvrior trientine tetrahydrochloride Orphalan	Trial 1 (NCT03539952), 53 adults stable on penicillamine, randomly assigned to stay on it or switch to Cuvrior for 24 weeks Trial record or paper	Copper not bound to ceruloplasmin at week 36 was similar to penicillamine; 24-hour urine copper was lower after switching, which the label says is seen when moving to any trientine
Galzin zinc acetate Eton Pharmaceuticals	A copper balance study at 1 US center in 60 people already de-coppered by a chelator, testing several dose schedules	Measured whether each dose schedule kept copper intake and loss in balance over 10 days in the hospital

Safety

Wilson Disease treatment side effects and warnings

Cuprimine, Depen carries a boxed warning, the FDA's strongest. The rest list their main precautions. Side effect rates show how many people in each drug's trials reported each one, whether or not the drug caused it.

Wilson Disease treatments: most common side effects and key warnings from the FDA labels
Drug	Most common side effects	Key warning
Cuprimine, Depen penicillamine (generics available) Bausch Health (Cuprimine); Viatris (Depen); generics	stomach upset 17%, loss or change of taste 12%, protein in the urine 6%, rash 5% and low platelets 4%	Boxed warning Boxed warning: doctors must know its toxicity and keep patients under close supervision. Fatal blood and kidney problems have been reported, so blood counts and urine tests are needed every 2 weeks for 6 months and then monthly.
Syprine trientine hydrochloride (generics available) Bausch Health; generics	iron deficiency, lupus, reported in a study and dystonia, muscle spasms and myasthenia gravis, reported after approval	No boxed warning. Watch for iron deficiency anemia, especially in women. The label says it cannot be considered interchangeable with penicillamine.
Cuvrior trientine tetrahydrochloride Orphalan	stomach pain 19% vs 4% on penicillamine, change in bowel habits 15% vs 0%, rash, hair loss and mood swings	No boxed warning. Symptoms, including neurologic ones, can worsen early in treatment; the label also warns of copper deficiency, iron deficiency and allergic reactions. Not studied in children.
Galzin zinc acetate Eton Pharmaceuticals	stomach irritation and raised alkaline phosphatase, amylase and lipase in blood tests, which usually settle within 1 to 2 years	No boxed warning. It is for maintenance after chelation, not the first treatment of someone with symptoms.

Cost

Help paying for Wilson disease treatment

Drugmaker copay and free-drug programs, plus charity funds for the condition, checked every week.

Insurance said no? Your Insurer Denied a Rare Disease Drug and Fewer Than 1 in 100 People Appeal, So Here Is the Playbook · 14 min read

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Questions

Wilson Disease treatment questions people ask

Penicillamine vs trientine for Wilson disease: what is the difference?

Both are chelators that bind copper so it leaves in the urine.

Approved use: Penicillamine is approved for Wilson disease in general; Syprine (trientine hydrochloride) is for people who cannot tolerate penicillamine, and Cuvrior is for stable adults already treated with penicillamine.

Warnings: Penicillamine carries a boxed warning and needs blood and urine tests every 2 weeks for the first 6 months; the trientines have no boxed warning.

Evidence: The AASLD guidance notes no head-to-head trial has compared them as a first treatment.

More: penicillamine, Syprine, Cuvrior

Can I switch from penicillamine to Cuvrior?

Cuvrior is approved for adults with stable Wilson disease who are de-coppered and tolerate penicillamine, and its label gives a conversion table for the switch.

Trial: In 53 stable adults, copper not bound to ceruloplasmin stayed similar after switching for 24 weeks.

More: Cuvrior

Is there a generic Wilson disease medicine?

Yes. Penicillamine and trientine hydrochloride are sold as generics; the first generic trientine hydrochloride was approved in February 2018. Cuvrior and Galzin have no generics.

Can zinc be used on its own for Wilson disease?

Galzin is FDA approved for maintenance after a person has first been treated with a chelator. Its label says it is not for the first treatment of someone with symptoms. Doctors decide when and whether to move someone to zinc, based on copper tests.

More: Galzin

What foods should I avoid with Wilson disease?

The penicillamine label advises keeping dietary copper low and avoiding foods rich in copper, such as liver, shellfish, nuts, chocolate, mushrooms, molasses, broccoli and copper-fortified cereals, and using distilled water if tap water has more than 0.1 mg of copper per liter. Ask your care team how strict to be with your medicine.

Go deeper

More on Wilson Disease at Trial Friend

Sources

Where every number on this page comes from

Approved-drug facts are from the current FDA prescribing information on DailyMed, with the label's effective date. Investigational-drug facts are from ClinicalTrials.gov and the sources named in each row.

Cuprimine, Depen (penicillamine (generics available)) prescribing information, Bausch Health (Cuprimine); Viatris (Depen); generics, label dated Jan 2026. DailyMed
Syprine (trientine hydrochloride (generics available)) prescribing information, Bausch Health; generics, label dated Sep 2020. DailyMed
Cuvrior (trientine tetrahydrochloride) prescribing information, Orphalan, label dated Jun 2025. DailyMed. Pivotal trial: ClinicalTrials.gov
Galzin (zinc acetate) prescribing information, Eton Pharmaceuticals, label dated Nov 2025. DailyMed

This page compares what the FDA labels and pivotal trials report. It is not medical advice, and no trial on this page compared these drugs with each other. Written and checked by Jason Hunter; the method is on the editorial standards page.