Apokyn

Treatment of Parkinson's Disease "Off" Episodes

Apokyn is specifically used for the acute, intermittent treatment of "off" episodes in individuals with advanced Parkinson's disease. These episodes, often referred to as hypomobility, occur when standard maintenance medications (such as levodopa and carbidopa) wear off or do not work consistently.

During an "off" episode, a person may experience a variety of symptoms that make movement difficult, including:

• Muscle stiffness or rigidity
• Slowed movement (bradykinesia)
• Difficulty walking or "freezing" in place
• Inability to perform daily tasks or speak clearly

Apokyn is intended to be used as needed to help a person regain mobility quickly during these periods. It is not meant to replace regular Parkinson's medications or to prevent "off" episodes from occurring. It does not cure Parkinson's disease.

Mechanism of Action

Apokyn belongs to a class of medications known as dopamine agonists. In Parkinson's disease, the brain loses the ability to produce enough dopamine, which is a chemical messenger responsible for smooth muscle movement and coordination.

When dopamine levels are low, individuals may experience "off" episodes, where symptoms like stiffness, tremors, and difficulty moving return because other medications are not working effectively. Apokyn helps manage these episodes by:

• Stimulating dopamine receptors in the brain.
• Acting as a substitute for the missing natural dopamine.
• Helping the brain send the necessary signals to the muscles to allow for movement.

Because the medication is administered as an injection under the skin, it is absorbed quickly into the system. This allows it to start working rapidly to reverse the symptoms of an "off" episode.

Important Distinctions

Despite its name, apomorphine is not a narcotic or an opioid. It does not provide pain relief and does not have the same addictive properties as morphine. Its primary function is strictly related to the stimulation of dopamine pathways to improve motor function.

Common Side Effects

The most frequently reported side effects of Apokyn include:

• Nausea and vomiting
• Dizziness or lightheadedness
• Drowsiness or sleepiness
• Yawning
• Runny nose
• Increased sweating or flushing
• Swelling of the legs, ankles, or feet
• Bruising, redness, or a small lump at the injection site

Serious Side Effects

Seek medical help immediately if you experience any of the following serious symptoms:

• Fainting or feeling like you might pass out
• Hallucinations, confusion, or unusual changes in behavior
• Falling asleep suddenly during activities like driving, eating, or talking
• Chest pain or a fast, irregular heartbeat
• New or increased intense urges, such as gambling, spending money, or sexual urges
• A painful erection or an erection that lasts longer than four hours
• Shortness of breath
• Severe nausea or vomiting that does not improve

Severe Drug Interactions

Apokyn must not be used in combination with 5HT3 antagonist medications, such as ondansetron, granisetron, dolasetron, palonosetron, or alosetron. Using these drugs together can cause a severe drop in blood pressure and a complete loss of consciousness.

Low Blood Pressure and Fainting

This medication can cause a significant decrease in blood pressure, especially when moving from a sitting or lying position to standing (orthostatic hypotension). This may result in dizziness, lightheadedness, or fainting (syncope). Healthcare providers typically monitor blood pressure closely when treatment begins or when the dose is adjusted.

Sudden Sleep Onset

Some people taking Apokyn have reported falling asleep suddenly during daily activities, including while driving. This can occur without any prior warning signs or feelings of drowsiness. Caution is advised when engaging in activities that require constant alertness.

Hallucinations and Psychotic Behavior

Apokyn may cause hallucinations, which involve seeing or hearing things that are not real. It can also lead to confusion, disorientation, or aggressive behavior. Individuals with a history of major psychotic disorders are generally advised against using this medication.

Impulse Control Issues

There are reports of patients experiencing intense, uncontrollable urges while taking dopamine agonists like Apokyn. These urges may include:

• Pathological gambling
• Increased sexual urges
• Binge eating
• Compulsive spending or buying

Other Serious Precautions

• Nausea and Vomiting: Severe nausea is a common side effect. While anti-nausea drugs are often used, specific types (5HT3 antagonists) are strictly prohibited.
• Heart Rhythm Changes: Apokyn may affect the heart's electrical activity, known as QT prolongation, which can lead to serious heart rhythm disturbances.
• Priapism: This medication can cause painful, prolonged erections. This is a medical emergency that requires immediate attention to prevent permanent tissue damage.
• Sulfite Sensitivity: Apokyn contains sodium metabisulfite. This can cause life-threatening allergic reactions, including anaphylaxis or severe asthma attacks, in people sensitive to sulfites.
• Dyskinesia: The medication may cause or worsen involuntary muscle movements, such as twitching or jerking.

Pregnancy

It is not known whether Apokyn will harm an unborn baby. There are no adequate or well-controlled studies in pregnant women to determine the risks. In animal studies, high doses of the medication were associated with developmental issues and birth defects. Because of the lack of human data, this medication should only be used during pregnancy if the potential benefit outweighs the potential risk to the fetus.

Breastfeeding

It is not known if Apokyn passes into breast milk or if it could affect a nursing infant. Because many drugs are excreted in human milk, caution is recommended if you are breastfeeding while using this medication. If you are pregnant, planning to become pregnant, or breastfeeding, you should discuss the risks and benefits of treatment with your healthcare provider.

Available Forms

Apokyn is provided as a sterile solution for injection under the skin (subcutaneous). The medication is available in the following form:

• Injection Cartridges: These glass cartridges are designed for use with a reusable injector pen.

The solution is clear and colorless. Generic versions are also available as injection cartridges, which must be used with a compatible, separately packaged injector pen.

FDA Approval and Indications

Apokyn (apomorphine hydrochloride injection) is FDA-approved for the acute, intermittent treatment of hypomobility, or "off" episodes, associated with advanced Parkinson's disease. These episodes include "end-of-dose wear-off" and unpredictable "on/off" periods. It is intended for use as an adjunct to other Parkinson's medications.

Generic Status

In 2022, the FDA approved the first generic version of apomorphine hydrochloride injection cartridges. The FDA noted that the generic version requires a separately packaged, reusable injector pen for administration.

Safety and Regulatory Requirements

The FDA has established specific safety protocols for Apokyn, including:

• Contraindications: Apokyn must not be used with 5-HT3 antagonists (such as ondansetron, granisetron, or dolasetron) due to the risk of severe low blood pressure and loss of consciousness.
• Initial Dosing: The first dose should be administered under medical supervision where blood pressure can be monitored, as the drug can cause significant orthostatic hypotension (a drop in blood pressure when standing).
• Antiemetic Use: Because the medication causes severe nausea, regulatory labeling recommends starting a non-5-HT3 antagonist anti-nausea medication several days before the first dose.

Generic Availability

The FDA approved the first generic version of Apokyn (apomorphine hydrochloride injection) in 2022. Generic medications are typically less expensive than brand-name versions while providing the same clinical benefits. The availability of a generic option may significantly reduce out-of-pocket costs for many patients.

Factors Influencing Cost

Several factors can influence the final price paid for this medication:

• Insurance Coverage: Most insurance plans, including Medicare Part D, provide some level of coverage for apomorphine. The specific co-payment or co-insurance amount depends on the plan's formulary tier for the drug.
• Pharmacy Choice: Prices can vary between different retail pharmacies and specialty pharmacies.
• Dosage and Frequency: Because Apokyn is used as needed to treat "off" episodes in Parkinson's disease, the total monthly cost will depend on how frequently a patient requires injections.

Additional Expenses

When using the generic version of apomorphine, the pen injector device is packaged separately from the medication cartridges. Patients should verify if the cost of the pen is included in their prescription coverage or if it requires a separate purchase. Some manufacturers or non-profit organizations may offer patient assistance programs or co-pay cards to help eligible individuals manage the cost of treatment.