Write down the classification of posology.

Here’s a clear classification of posology — the science of determining the correct dose of medicines — as understood in both general pharmacology and homoeopathy.

1. Based on the Nature of the Dose
Minimum Dose – The smallest quantity that produces a therapeutic effect without causing harm.
Maximum Dose – The largest quantity that can be given safely without toxic effects.
Toxic Dose – Produces harmful or poisonous effects.
Lethal Dose – Causes death (LD₅₀ in experimental terms).
Therapeutic Dose – The quantity required to produce the desired effect in most patients.
2. Based on Frequency and Duration
Single Dose – Given once for a specific effect (e.g., a single antibiotic prophylaxis before surgery).
Repeated Dose – Given at intervals to maintain drug levels.
Maintenance Dose – Keeps the drug concentration within the therapeutic range after a loading dose.
Loading Dose – A higher initial dose to quickly reach therapeutic levels.
Titrated Dose – Gradually adjusted up or down to find the optimal effect.
3. Based on Method of Determination
Standard Dose – Fixed amount for most patients, based on average needs.
Individualized Dose – Adjusted according to patient-specific factors (age, weight, organ function, sensitivity).
Regulated Dose – Modified according to measurable physiological parameters (e.g., insulin by blood glucose levels).
Target Level Dose – Based on achieving a specific blood concentration of the drug.
4. In Homoeopathic Context
Physiological Dose – Produces direct physiological changes (rarely used in homoeopathy).
Pathological Dose – Produces pathological changes in tissues.
Infinitesimal Dose – Extremely small, potentized doses acting on the dynamic plane.
Minimum Effective Dose – The least amount needed to stimulate the vital force.
Repetition of Dose – Decided based on acute vs. chronic cases and patient sensitivity.

💡 In summary: Posology can be classified by how much drug is given, how often it’s given, how it’s calculated, and — in homoeopathy — how it’s potentized and repeated.