There is no fixed dosage for any medication , it varies from person to person. Minoxidil dosage will be changed considering factors like work , exercise , dryness of scalp etc .Minoxidil usually makes hair look greazy , so some people don’t prefer applying it for work. And quantities will be changed depending on head size , applying large quantities for small scalp area may cause dripping of medication onto your face
Next Steps
Consult a dermatologist online for evaluation