At the end of that ten minutes, re-evaluate your craving
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If you think the medication is too big or will violate the TSA liquid rules, there are exceptions for medical supplies so you likely can still bring it through airport security
In a later teshuvah (Yoreh Deiah 3:36) he discusses risky surgeries and rules that one would not be allowed to undergo such procedures for the sake of eliminating pain (not all agree with this psak), and further argues that if someone is very ill and might die without a risky intervention, while he may be allowed to undergo it, he is by no means obligated
If in doubt, click the link to see the list of prohibited items (you can't sell firearms, alcohol, or tobacco, among other items), but otherwise pick the category that best suits your for-sale item