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I am not kidding here. I have had at least mild allergic reactions to almost every single prescription drug I've taken in the past 4 years, since I developed an allergy to coconut, but of course, I don't think any of them have SLS in them, so I don't know what it really is.
Anyway, I decided to get crazy and look up some random common drugs that may contain SLS. Of course, I don't have time to look them ALL up, so this is just to give you an example. Most drugs don't contain it. Sometimes some dosages don't have the capsules, so all the rules apply, except when they don't, of course! There seems to be no rhyme or reason to the types of drugs that contain it.
B12 capsules
CIALIS® (tadalafil)
CYMBALTA® (duloxetine hydrochloride)
Deconsal (Guaifenesin)
Lyrica (pregabalin)
Robaxin (methocarbamol)
Vibra-Tabs® (doxycycline hyclate, USP)