One of the things that surprises European travellers, is the size and diversity of American pharmacies. If this applies to any spot of the wide American geography, when it comes to New York, the stores (because that´s what they are), acquire the size of a superstore. One of these big chains which offer medical and pharmaceutical services is Duane Reade, with stores in all the important districts in the Big Apple, although the one I put to you here is on Broadway. If the musicians district is a bit far from where you are, you just have to go on their website where they´ll inform you of the closest store to you and also of the doctors on call available at each time.
In these complexes, open 24 hours a day, 365 days a year, also offer online orders. Here you can buy from a medicine for headache to products which are more appropriate of a European pharmacy. So, write down the name, it´s good to have it at hand in your apartments in New York which you´ll use as your headquarters while you visit this impressive but also educated and organized city.