PK-Merz Tablet 100mg

About PK-Merz Tablet 100mg

PK-Merz Tablet 100mg Uses

• Managing Parkinson's disease and Parkinsonian syndrome
• Treating drug-induced extrapyramidal reactions from antipsychotic medicines
• Relieving post-herpetic (post-zoster) nerve pain
• Improving tremor, muscle stiffness and slow movement in Parkinsonism
• Used historically as an antiviral agent against influenza A
• Sometimes added as adjunct therapy in select hepatitis C treatment regimens

PK-Merz Tablet 100mg Benefits

• Eases muscle rigidity and improves motor control in Parkinson's patients
• Reduces tremors that interfere with daily activities
• Helps restore smoother movement and balance over time
• Offers relief from nerve pain following shingles infection
• Convenient oral tablet dosing compared to injectable Parkinson's therapies

What Experts Say

Neurologists in Pakistan often prescribe PK-Merz Tablet 100mg as an add-on therapy once levodopa alone stops controlling tremors, stiffness and slow movement in Parkinson's disease. Amantadine works through a different pathway than levodopa, blocking NMDA glutamate receptors in the brain, which is why doctors pair the two rather than relying on either alone in moderate to advanced cases.

Physicians usually start with one tablet twice daily for the first few weeks before raising the dose, since a slow build up limits early dizziness and confusion. Kidney function is checked before and during treatment, because amantadine is cleared almost entirely through the kidneys and Pakistan carries a high burden of undiagnosed diabetes and chronic kidney disease that can silently raise drug levels to unsafe amounts.

Psychiatrists also reach for this tablet when antipsychotic medicines trigger stiffness, tremor or restlessness as a side effect, since amantadine reverses these drug-induced movement problems without weakening the original psychiatric treatment. Doctors caution patients never to stop the tablet abruptly, as sudden withdrawal can trigger a rebound worsening of Parkinson's symptoms within days.

Drug Class

• Antiviral / Antiparkinsonian agent (NMDA receptor antagonist)

PK-Merz Tablet 100mg formula

• Amantadine Sulphate

Available forms

• Tablet

How to use PK-Merz Tablet 100mg?

• Take one tablet twice daily for the first four weeks, then your doctor may raise this to three times daily for Parkinsonism
• For post-herpetic neuralgia or drug-induced Parkinsonism, the usual dose is one tablet twice daily
• Advanced Parkinson's cases may need up to five tablets a day, only as directed by a neurologist
• Swallow the tablet with a glass of water, preferably in the morning and afternoon
• Avoid taking a dose late in the evening, since it can disturb sleep
• Can be taken with or without food
• Do not stop this tablet suddenly without your doctor's advice

Drug Interactions

• Anticholinergic Medicines: Combining with drugs like trihexyphenidyl can increase confusion and hallucination risk
• CNS Depressants and Alcohol: Raises the risk of added drowsiness and dizziness
• Sodium Bicarbonate and Urine Alkalinizers: Can reduce amantadine clearance and raise its blood levels
• Live Nasal Flu Vaccine: Avoid within two weeks of taking amantadine, as it may reduce vaccine effectiveness

Risks and warnings

• Kidney Disease: Amantadine is cleared through the kidneys, and doses must be lowered for reduced kidney function since overdose has caused fatal reactions in patients with kidney impairment
• Epilepsy: Use with caution as amantadine can lower the seizure threshold in people with a seizure disorder
• Glaucoma: Avoid in narrow angle glaucoma, since amantadine can raise eye pressure
• Enlarged Prostate: Use cautiously in men with prostate hypertrophy due to a risk of urinary retention
• Pregnancy: Animal studies show embryotoxic and teratogenic effects, so use only if the benefit clearly outweighs the risk
• Breastfeeding: Amantadine passes into breast milk, and nursing should be stopped if the infant develops side effects
• Drowsiness: Can cause sudden sleepiness during normal daily activities, so avoid driving until you know how it affects you

PK-Merz Tablet 100mg Side Effects

• Dizziness and lightheadedness
• Dry mouth
• Difficulty sleeping or restlessness
• Swelling in the legs or feet
• Nausea and constipation
• Visual hallucinations, more common in elderly patients
• Livedo reticularis, a mottled purplish skin discoloration on the legs with long-term use
• Confusion or agitation
• Fast or uneven heartbeat, mainly reported with high doses

Storage Conditions

• Store below 30°C in a cool, dry place away from direct sunlight
• Keep tablets in their original blister pack until ready to use
• Keep out of reach of children
• Do not use after the expiry date printed on the pack