Exit the complex of Santa Maria Novella through the ancient dormitory. Once outside in Piazza della Stazione, take a left and turn left again in via Santa Caterina da Siena. At the traffic light, once again turn left again in via della Scala. Walk straight until you reach number 16. The entrance to the pharmacy is on your left. The entrance is free and the shop is open every day from 10 am to 7 pm.