Minoxinol 5% w/v Solution is a vasodilator used to promote hair growth in men with male pattern baldness. It should be applied directly to the scalp area and should be used continuously to maintain hair growth. Common side effects include itching, excessive hair growth, rash, and dermatitis. It is not suitable for individuals under 18 or over 65, those with hair loss due to medications or nutritional deficiencies, high blood pressure, or those with heart disease or blood circulation problems. Consult a doctor if the condition does not improve or worsen after 4 to 6 months.