Benzodiazepine Conversion Calculator

Benzodiazepines vary significantly in potency, receptor affinity, and pharmacokinetic half-life. To safely convert one agent to another, clinical practice relies on established equivalence ratios anchored to a reference drug, typically alprazolam or diazepam. The fundamental mathematical relationship uses a multiplier or divisor based on the target drug's relative strength. For instance, if Drug A requires a lower milligram dose than Drug B to achieve the same sedative effect, its conversion factor reflects that higher potency. The general equation scales the initial dose by its conversion ratio to yield the equivalent therapeutic dose of the destination benzodiazepine.

Let us walk through a practical conversion scenario. Suppose a patient is currently taking 0.5 mg of alprazolam (Xanax) daily and needs to be transitioned to an equivalent daily dose of lorazepam (Ativan). According to standard equivalence tables, alprazolam is twice as potent as lorazepam, meaning the conversion factor is 2 milligrams of lorazepam for every 1 milligram of alprazolam. The mathematical calculation is: 0.5 mg (alprazolam) multiplied by 2 equals 1.0 mg of lorazepam. Therefore, the clinically equivalent target dose for the patient is 1.0 mg of lorazepam daily, split according to their prescribing physician's schedule.

Always consult a licensed medical provider or clinical pharmacist before making any changes to your medication regimen. Cross-tolerance calculations provide a baseline estimate rather than an exact physiological equivalent due to individual metabolic variations, liver enzyme function, and long-term receptor adaptation. When executing a medication switch or implementing a dose reduction taper, clinical monitoring for withdrawal symptoms, excessive sedation, or therapeutic loss of efficacy is essential.