The round, light green pill debossed with “TEVA” on one side and “833” on the reverse is Clonazepam 1 mg, manufactured by Teva Pharmaceuticals USA. It is a generic equivalent of Klonopin and is classified as a Schedule IV (C-IV) controlled substance in the United States due to its potential for misuse, physical dependence, and addiction.
Pill Identification
Attribute – Specification
- Imprint (Front / Back) – TEVA on one side / 833 on the other side (bisected/scored)
- Active Ingredient – Clonazepam (1 mg)
- Color – Light green
- Shape – Round
- Manufacturer – Teva Pharmaceuticals USA
- Drug Class – Benzodiazepine / Anticonvulsant / Anxiolytic
- DEA Schedule – Schedule IV (C-IV) |
Mechanism of Action
Clonazepam acts as a positive allosteric modulator of the gamma-aminobutyric acid type A receptor complex in the central nervous system (CNS):
- GABA Enhancement: By binding to a specific benzodiazepine site on the receptor, it increases the receptor’s affinity for GABA.
- Chloride Channel Opening: This binding increases the frequency of chloride ion channel openings, leading to hyperpolarization of the postsynaptic neuronal membrane.
- Neuronal Inhibition: The resulting decrease in neuronal excitability produces anticonvulsant, sedative, muscle relaxant, and anxiolytic effects.
- Pharmacokinetics: Onset of action typically occurs within 20 to 60 minutes, with peak concentrations achieved in 1 to 4 hours. It has a long elimination half-life of approximately 18 to 50 hours.
Dosage and Administration
- Panic Disorder (Adults):
- Starting Dose: Typically 0.25 mg twice daily (or 0.5 mg once daily at bedtime).
- Maintenance Dose: May be gradually increased by 0.125 mg to 0.25 mg increments every 3 days toward a target dose of 1 mg/day, up to a maximum of 4 mg/day in divided doses.
- Seizure Disorders (Adults):
- Starting Dose: Usually 0.5 mg to 1.5 mg/day divided into three doses.
- Titration: Can be increased by 0.5 mg to 1 mg every 3 days until seizures are controlled, up to a typical maximum of 20 mg/day.
- Administration: Swallow with water. It can be taken with or without food. Because it causes drowsiness, daily doses or larger portions are often scheduled at bedtime.
Side Effects
Common Side Effects
- Somnolence (drowsiness) and sedation
- Ataxia (loss of balance or motor coordination)
- Dizziness and lightheadedness
- Fatigue and muscle weakness
- Increased salivation / hypersalivation (notable in seizure patients)
- Cognitive dulling and memory impairment
Serious Adverse Reactions
- Profound CNS and Respiratory Depression: Slowed or stopped breathing, especially when combined with other sedatives.
- Paradoxical Reactions: Increased agitation, irritability, aggression, hallucinations, or acute behavioral changes (more common in pediatric or geriatric populations).
- Suicidal Ideation and Behavior: Worsening depression or emergence of suicidal thoughts.
- Severe Allergic Reactions: Angioedema, hives, difficulty breathing.
Precautions and Drug Interactions
- Opioids and CNAS Depressants: Combining clonazepam with opioid pain medications, sedatives, barbiturates, or alcohol drastically increases the risk of extreme sedation, fatal respiratory arrest, and coma.
- CYP3A4 Inhibitors/Inducers: Clonazepam is extensively metabolized by hepatic CYP3A enzymes. Inhibitors (e.g., fluconazole, clarithromycin) can raise clonazepam serum concentrations; inducers (e.g., carbamazepine, rifampin) can lower its efficacy.
- Contraindications: Severe hepatic impairment, significant acute narrow-angle glaucoma, and documented hypersensitivity to benzodiazepines.
- Pregnancy and Lactation: Passes the placenta and enters breast milk. Use during pregnancy can lead to neonatal flaccidity, feeding difficulties, and neonatal withdrawal syndrome.
Critical Warnings (FDA Boxed Warnings)
- Risks from Concomitant Use with Opioids: Co-prescription of benzodiazepines and opioids may cause profound sedation, respiratory depression, coma, and death.
- Abuse, Misuse, and Addiction: Use of clonazepam, even at recommended doses, exposes users to risks of abuse, misuse, and addiction, which can lead to overdose or death.
- Dependence and Withdrawal Reactions: Continued use can lead to clinically significant physical dependence.
- Do Not Stop Abruptly: Discontinuing clonazepam suddenly or rapidly reducing the dose can trigger life-threatening withdrawal symptoms, including status epilepticus (continuous seizures), psychosis, tremors, hallucinations, and severe rebound anxiety. Discontinuation requires a slow, medically supervised taper.