1. Clinical Overview
Piracetam is a synthetic nootropic agent of the racetam class, chemically a derivative of the neurotransmitter GABA. It is a cyclic derivative of GABA (gamma-aminobutyric acid) but does not bind to GABA receptors. It is primarily used for its cognitive-enhancing and neuroprotective effects, improving neuronal and cognitive functions without acting as a sedative or stimulant. In India, it is widely prescribed for cognitive deficits, cortical myoclonus, and as an adjunct in dyslexia.
| Onset | Duration | Bioavailability |
|---|---|---|
| Oral: 30 to 60 minutes. Peak plasma concentrations reached in approximately 1 hour. | Approximately 5 to 8 hours, correlating with its plasma half-life. | Approximately 90-100% following oral administration. |
2. Mechanism of Action
The exact mechanism is not fully elucidated. Piracetam is believed to act on neuronal and vascular functions. It modulates neurotransmission, enhances neuroplasticity, and improves cerebral microcirculation. It facilitates interhemispheric transfer of information via the corpus callosum and has protective effects against hypoxia and physical brain trauma.
3. Indications & Uses
- Symptomatic treatment of cognitive deficits in aging (senile dementia, Alzheimer's disease, vascular dementia)
- Cortical myoclonus (as monotherapy or adjunctive therapy)
- Vertigo and dizziness of central origin
4. Dosage & Administration
Adult Dosage: Cognitive impairment: 1.2-2.4 g/day in 2-3 divided doses, may increase to 4.8 g/day. Cortical myoclonus: Start at 7.2 g/day in 2-3 divided doses, increase by 4.8 g/day every 3-4 days to max 24 g/day. Maintenance: 12-24 g/day. Vertigo: 2.4-4.8 g/day in divided doses.
Administration: Oral: Can be taken with or without food. Tablets should be swallowed whole with a glass of water. For the 400mg strength, multiple tablets are typically required to achieve therapeutic doses. Therapy for cognitive disorders is long-term; abrupt discontinuation should be avoided, especially in myoclonus.
5. Side Effects
Common side effects may include:
- Nervousness
- Hyperkinesia (agitation, restlessness)
- Weight gain
- Drowsiness
- Asthenia (weakness)
- Dizziness
6. Drug Interactions
| Drug | Effect | Severity |
|---|---|---|
| Anticoagulants (Warfarin, Acenocoumarol) | Piracetam may inhibit platelet aggregation and increase bleeding risk. Increased risk of hemorrhage. | Major |
| Antiplatelet drugs (Aspirin, Clopidogrel) | Additive antiplatelet effect, increasing bleeding risk. | Major |
| NSAIDs (Ibuprofen, Diclofenac) | Increased risk of gastrointestinal bleeding due to combined effects on platelets and gastric mucosa. | Moderate |
| Thyroid hormones (Levothyroxine) | Piracetam may increase T4 levels and decrease T3 levels; monitor thyroid function. | Moderate |
| Antipsychotics (Haloperidol) | May reduce efficacy of haloperidol in Huntington's chorea; may increase extrapyramidal symptoms. | Moderate |
| Other CNS stimulants (Modafinil, Methylphenidate) | Additive stimulant effects, may increase nervousness and insomnia. | Moderate |
7. Patient Counselling
- DO take the medicine exactly as prescribed by your doctor.
- DO inform your doctor about all other medicines you are taking, especially blood thinners.
- DO get your kidney function tested as advised by your doctor.
- DONT stop taking this medicine suddenly, especially if prescribed for myoclonus.
- DONT crush or chew the tablets; swallow them whole with water.
- DONT self-medicate or increase the dose without consulting your doctor.
8. Toxicology & Storage
Overdose: Symptoms are primarily an extension of side effects: severe diarrhea, abdominal pain, nervousness, agitation, insomnia, and possibly confusion. In massive overdose, bleeding diathesis or exacerbation of seizures may occur.
Storage: Store below 30°C, in a cool, dry place, protected from light and moisture. Keep out of reach of children. Do not use after the expiry date printed on the pack.