Dosage refers to the specific amount and timing of medication prescribed for a patient. Proper dosage depends on many factors: the drug itself, the condition being treated, patient characteristics (age, weight, kidney/liver function), other medications being taken, and desired therapeutic effect balanced against side effects. Dosages are expressed in various units (milligrams, millilitres, units) and may be taken at specific intervals (once daily, every 4 hours). Following prescribed dosages is crucial—too little may be ineffective while too much can cause toxicity or dangerous side effects. Pharmacists verify dosages when dispensing medications and can advise on proper administration. Special populations (children, elderly, pregnant women, those with organ impairment) often require adjusted dosages. Patients should never change dosages without consulting healthcare providers and should report any problems with their medications.