The pill debossed with the imprint EP 904 is a generic formulation of Lorazepam (0.5 mg). Lorazepam belongs to the benzodiazepine class of medications. It is a potent, fast-acting central nervous system (CNS) depressant primarily prescribed for the short-term management of severe anxiety disorders and related conditions.
Because of its potential for abuse, dependence, and addiction, lorazepam is classified as a Schedule IV Controlled Substance in the United States and is strictly regulated worldwide.
Pill Identification
Verifying a pill’s physical characteristics ensures you are taking the correct drug and strength.
- Imprint: EP 904
- Strength: 0.5 mg
- Color: White to off-white
- Shape: Round
- Features: Flat face with a beveled edge. One side is debossed with “EP 904” and the opposite side is plain (unscored).
- Manufacturer: Lannett Company, Inc. (originally under the Heritage/Exeter Pharmaceuticals label)
Mechanism of Action
Lorazepam targets specific neurotransmitters within the brain to lower overall nerve activity.
- GABA Receptor Binding: Lorazepam binds to specific benzodiazepine receptors on the post-synaptic GABA receptor complex in the central nervous system.
- Enhancing GABA Activity: It acts as a positive allosteric modulator, meaning it enhances the effects of gamma-aminobutyric acid (GABA), the primary inhibitory neurotransmitter in the brain.
- Chloride Channel Hyperpolarization: When lorazepam binds, it increases the frequency with which the associated chloride ion channel opens. This allows an influx of negatively charged chloride ions into the nerve cell, hyperpolarizing the membrane.
- The Result: The nerve cell becomes much less responsive to excitatory signals. By dampening abnormal and excessive electrical activity across the brain, it provides rapid anti-anxiety (anxiolytic), sedative, muscle-relaxant, and anticonvulsant effects.
Indications and Dosage
Oral lorazepam is highly bioavailable (about 90%) and acts rapidly, with peak plasma concentrations reaching their maximum roughly 2 hours after ingestion.
Clinical Indications
- Short-term management of anxiety disorders or temporary relief of anxiety associated with depressive symptoms.
- Short-term treatment of insomnia caused by transient situational stress or severe anxiety.
- Note: Injectable forms (not the EP 904 tablet) are also used as surgical pre-medications or to halt status epilepticus (prolonged seizures).
Standard Dosage
- For Anxiety: The typical adult starting dose is 2 mg to 3 mg per day, split into two or three evenly divided doses (e.g., taking two or three EP 904 tablets spread across the day). A physician may adjust this total daily dosage between 1 mg and 10 mg based on response.
- For Insomnia: A typical single dose of 2 mg to 4 mg (four to eight EP 904 tablets) may be prescribed strictly at bedtime.
- Elderly or Debilitated Patients: Older adults are significantly more sensitive to benzodiazepines. Initial dosing is heavily reduced usually 1 mg to 2 mg per day in divided doses to minimize the risk of excessive sedation or accidental falls.
- Duration: Therapy is generally limited to 2 to 4 weeks. Systematic clinical trials have not evaluated the drug’s efficacy beyond 4 months, and long-term daily use is heavily discouraged.
Side Effects
Because lorazepam slows down neural activity, side effects typically relate to generalized central nervous system depression.
Common Side Effects
- Somnolence (Drowsiness) & Sedation: Affects up to 16% of patients.
- Dizziness and Lightheadedness
- Asthenia: Feeling physically weak or drained of energy.
- Ataxia: Unsteadiness, poor coordination, or loss of balance.
Less Common / Rare Side Effects
- Anterograde Amnesia: Difficulty forming new memories after taking the dose.
- Paradoxical Reactions: Instead of calming the patient, the drug occasionally triggers a reverse reaction, causing intense agitation, irritability, nightmares, rage, or violent behavior.
- Respiratory Depression: Severely slowed or shallow breathing, particularly at high doses.
Boxed Warnings and Abuse Risks
Lorazepam carries strict regulatory and clinical warnings regarding its safety profile:
FDA Boxed Warnings
- Risks from Concomitant Use with Opioids: Taking benzodiazepines alongside opioid pain or cough medicines (e.g., oxycodone, hydrocodone, codeine) can result in profound sedation, respiratory depression, coma, and death.
- Abuse, Misuse, and Addiction: Use of lorazepam exposes users to the risks of abuse and addiction, which can lead to overdose or life-threatening physical consequences.
- Physical Dependence and Withdrawal: Stopping the medication abruptly after continuous use can precipitate severe, acute withdrawal syndromes that can be fatal (e.g., status epilepticus, severe tremors, hallucinations).
Precautions and Contraindications
- Contraindications: Do not take the EP 904 pill if you have a known hypersensitivity to benzodiazepines or have acute narrow-angle glaucoma.
- Alcohol Interaction: Never consume alcohol while taking lorazepam. Alcohol synergistically multiplies the depressive effects of the medication on the brain stem, drastically increasing the risk of respiratory arrest and fatal overdose.
- Abrupt Cessation: If you have been taking this medication daily for more than a few weeks, do not stop taking it cold turkey. A doctor must implement a slow, structured taper to gradually step down the dosage safely.
- Respiratory Health: Use with extreme caution if you suffer from compromised respiratory function, such as severe Chronic Obstructive Pulmonary Disease (COPD) or Sleep Apnea.
- Pregnancy and Lactation: Lorazepam can cause fetal harm when administered to pregnant women, potentially leading to floppy infant syndrome or neonatal withdrawal symptoms. It also passes into breast milk; therefore, nursing while taking this drug is not recommended.