i and many other would never pay anything available in bitcoins with any other payment option.
This.
Word.
I am a big fan of Bitcoin, but I would use Visa and PayPal where their specific offerings would benefit me... where the extra 2-5% that's ultimately coming out of my pocket buys me some leverage where I need it. My Bitcoin is like gold to me - if I can pay you with good money or lousy money and everything is the same, you won't get my Bitcoins. I must concede that there are cases where the premium charged by Visa/MC or the seller-unfriendly policies of eBay give me a palpable benefit as a customer... for everything else, there's Bitcoin.
If Bitcoin gives me a convenience, privacy, security, price, or other advantage that interests me, then I'll pay with Bitcoin.
In this case, Bitcoin is the clear best choice for me buying prescription drugs in circumvention of having to see a doctor and get a prescription and deal with my pharmacy. Using PayPal for this is shaky as international online pharmacy is against PayPal's acceptable use policy
(example) and the risk that my credit card number will be compromised is less tolerable to me than the risk I'll lose a few bucks if the pharmacy turns out to be bogus. I also get a credible excuse to not share my phone number (I hate getting marketing calls from online pharmacies).
On top of that, I hate how in the US, healthcare privacy is a joke. Anything you do has to get reported somewhere. Yeah, sure there is HIPAA, nobody is allowed to divulge anything without your consent, and health care providers take that very seriously. But there's dozens of things you can't get without giving up consent to break that privacy shield. Go get life insurance or medical insurance without signing a blanket statement authorizing anybody to divulge anything and everything you've ever gone to a doctor for. In some professions you can lose your job (imagine being an airline pilot and losing your job because they found out you went to a therapist or take xyz anti-depressant or whatever, given the recent mental breakdowns of flight crew in the news -
example). Enough said - Bitcoin is a perfect way to pay for healthcare-related stuff, and given how people's personal health information is systematically used and abused in the US, everyone has a stake in keeping their business private.