Symmetrel

Basic Symmetrel information

• INN (international nonproprietary name): Amantadine hydrochloride
• Brand names available in the United Kingdom: Symmetrel
• ATC code: N04BB01
• Forms and dosages: Capsules: 100 mg; syrup: 50 mg/5 mL
• Manufacturers in the United Kingdom: Various
• Registration status in the United Kingdom: Prescription-only medicine (POM)
• OTC / Rx classification: Prescription-only medicine (POM)

Everyday use and best practices

Morning vs evening dosing

Establishing a consistent dosing schedule for Symmetrel is crucial in optimising its therapeutic benefits. The optimal timing for taking Symmetrel can vary based on individual circumstances, but patients often find that taking the medication in the morning aligns better with their daily routines, especially for those managing Parkinson's disease or recovering from influenza. Taking Symmetrel consistently at the same time each day helps maintain stable blood levels of the medication. This stability can be important for symptom control and to avoid fluctuations that may lead to side effects. Whether choosing morning or evening dosing, consistency should be the focus for effective management of the condition.

Taking with or without meals

Symmetrel can be taken with or without food. Many patients find it beneficial to take it with food to reduce the risk of gastrointestinal side effects.

Safety priorities

Who should avoid it

Those with significant renal impairment or psychiatric disorders, including hallucinations or psychosis, are particularly cautioned against using this medication. Individuals with untreated angle-closure glaucoma should also avoid Symmetrel because the drug may worsen the condition. It's essential for patients to consult their healthcare provider to discuss these contraindications thoroughly before starting treatment.

Activities to limit

When on Symmetrel, certain activities may become less safe due to the medication's side effects such as dizziness, confusion, or reduced coordination. Operating heavy machinery or driving should be approached with caution. Patients are advised to assess their personal reaction to the drug and discuss any concerns with a healthcare professional. Safety should always be the priority; if unsure about how Symmetrel affects day-to-day activities, it's important to seek advice before engaging in tasks that involve significant responsibility or risk.

Dosage and adjustments

General regimen

For Parkinson’s disease the dose typically begins at 100 mg once daily, increased gradually to 100 mg once or twice a day depending on response. Dosing varies between individuals, so follow the prescriber’s instructions and do not adjust the dose yourself. Regular follow-ups with healthcare providers help to determine the most effective dosing schedule.

Special cases

For elderly patients, or those with coexisting health conditions such as renal impairment, it is crucial to consider dosage adjustments. Starting at a lower dose may be recommended, with careful monitoring for efficacy and side effects. This tailored approach helps to manage the risk of adverse reactions that may occur more frequently in older adults or those with multiple health issues.

What’s inside and how it works

Ingredients overview

Symmetrel is primarily composed of amantadine hydrochloride as its active ingredient. This compound belongs to the class of adamantane derivatives and is used in Parkinson’s disease and was also used for influenza A. Excipients may include lactose and starch, which can be relevant for those with sensitivities or intolerances.

Mechanism basics explained simply

Symmetrel works by enhancing the release of dopamine, a neurotransmitter responsible for movement and coordination. By improving dopamine activity, it can reduce the symptoms of Parkinson's disease. It also has antiviral activity against influenza A.

Main indications

Approved uses

Amantadine is licensed in the UK for Parkinson’s disease and for drug-induced extrapyramidal symptoms. It has also been licensed for the treatment and prophylaxis of influenza A virus infections, although its use against current seasonal flu strains is not recommended because of antiviral resistance.

Off-label uses in UK clinics

In clinical practice, some healthcare providers prescribe Symmetrel off-label for conditions such as fatigue management in patients with multiple sclerosis or following COVID-19. These uses are not licensed.

Interaction warnings

Food interactions (alcohol, tea/coffee)

When taking Symmetrel, patients should be aware of potential interactions with certain foods and beverages. For instance, alcohol can enhance side effects, including dizziness and impaired coordination. Caffeinated beverages like tea or coffee may add to nervousness or agitation, so moderating intake can help.

Drug conflicts

Patients should approach anticholinergics, other dopaminergic medicines, and other CNS-active drugs with caution, as the combination can exacerbate side effects or alter the effectiveness of treatment. Consulting with healthcare professionals can clarify risks associated with concurrent use.

Alternative choices

Alternatives to Symmetrel typically prescribed by the NHS for Parkinson’s disease include:

• Co-careldopa (levodopa/carbidopa): highly effective for Parkinson’s disease, but long-term use can lead to motor complications.
• Selegiline: can enhance the effects of levodopa; side effects may include insomnia and hallucinations.
• Rasagiline (Azilect): can be used alone or with levodopa; side effects may include headache and joint pain.
• Dopamine agonists (e.g. pramipexole): prolonged-release options are available, but there is a risk of impulse control disorders.

The choice depends on the individual patient and should be made with a healthcare provider.

Regulation snapshot

Frequently asked questions

What is Symmetrel used for?

Symmetrel is primarily used to treat Parkinson’s disease; it has also been used for influenza A virus infections.

Can Symmetrel be taken with other medications?

It’s crucial to consult a healthcare professional before combining Symmetrel with other medications, as it may interact adversely with certain drugs.

What should I do if I miss a dose?

If a dose is missed, take it as soon as possible unless it's close to the time for the next dose. Never double up.

Are there any serious side effects?

Serious side effects are rare but may include severe allergic reactions, hallucinations, or significant heart issues. Immediate medical attention is advised in such cases.

Guidelines for proper use

• Dosage: Adhere to the prescribed dosage, adjusting only upon healthcare provider advice to prevent adverse reactions.
• Side effects: Keep a note of any side effects experienced, noting their severity and duration.
• Regular consultations: Schedule regular follow-ups with your healthcare provider to assess treatment effectiveness and adjust the dosage if necessary.
• Emergency contacts: Keep emergency contact numbers readily available in case of severe side effects.

Delivery information