The present invention generally relates to compositions and methods for transdermal drug delivery. The compositions can be used in a variety of applications, including treating erectile dysfunction or sexual dysfunction, treating wounds, or causing or promoting hair growth. For example, in one aspect, the present invention is generally directed to compositions for delivery of nitric oxide, transdermally and/or to a mucosal surface. The composition may include nitric oxide. The nitric oxide may be present within a first phase comprising a lecithin, such as phosphatidylcholine. In certain embodiments, the lecithin is present in liposomes, micelles, or other vesicles containing nitric oxide. The composition can take the form of a gel, a cream, a lotion, an ointment, a solution, a solid “stick,” etc., that can be rubbed or sprayed onto the skin, e.g., onto the penis, vulva, or other suitable portion of the skin. The composition can also be applied to a mucosal surface in some instances. In some embodiments, a composition comprising nitric oxide is unexpectedly stable and can be stored long-term. Thus, for example, a composition of the invention may exhibit a long shelf life, with little loss or reaction of nitric oxide. This may be particularly useful for certain applications such as consumer products, including those described herein. Other aspects of the present invention are generally directed to methods of making or using such compositions, methods of promoting such compositions, kits including such compositions, or the like.本発明は、一般的には経皮薬物輸送のための組成物及び方法に関する。組成物は、様々な様態において使用でき、勃起障害又は性機能障害の治療、外傷の治療、又は毛髪成長及びその促進が含まれる。例えば、ある様態において、本発明の一般的な目的は、一酸化窒素の経皮及び/又は粘膜面への輸送のための組成物を提供することである。組成物は一酸化窒素を含有してよい。一酸化窒素は、フォスファチジルコリンを例とするレシチンを含有する第一の相内に含まれてよい。ある実施形態において、レシチンは一酸化窒素を含むリポソーム、ミセル、又は他のベシクル内に存在する。組成物はゲル、クリーム、ローション、軟膏、溶液、固体「スティック」、等の形態であってよく、皮膚、例えば陰茎、外陰部、又はその他の適切な皮膚の部分に塗布、又は噴霧される。いくつかの例において組成物は粘膜面にも適用できる。いくつかの実施形態において、一酸化窒素を含む組成物は予想に反して安定であり、長期間貯蔵できる。このように、例えば、本発明の組成物は一酸化窒素の損失や反応
