•Available OTC as a lower-cost generic
•Comes in many different formulations
•Can be applied directly to the painful area
•Generally well tolerated with few side effects
•Patches can be worn for up to 8 hours.
•Can't apply to irritated or damaged skin
•Shouldn't be used for more than 7 days at a time
•Can cause irritation if it makes contact with the eyes
•Shouldn't be used with other topical skin products
•Patches won't stick well to damp or wet skin.