Baggage Scenario: Yeah but in 30 to 90 days (time minus pissed persons next refill) you have a clean shop. In the meantime you establish relationships with the reasonable customers that remain and you have income. Cleaning house just requires adequate communication, a little flexibility and documentation.
No Baggage Scenario: However if you establish interest with your targeted prescribers in advance of investing that would be acceptable risk too. One of the (non-pharmacist) indie startups I oversaw assumed she had a corner on the market (spoke Persian in a predominately Persian neighborhood). 3 months 20 rxs max. I kept after her to market and she says "I tried" but that when she met one of the Persian docs he asked her "my patients can speak English so what do they need to change pharmacies for? "

I said to her "That's doctors for you. Forget about it and go see him again and again and again.

He will loosen up." Wouldn't do it. I bailed when they tried cut my pay and they were closed within a year. Now I hear she is located in a medical building but I guarantee she made more assumptions. Her ego couldn't hack the marketing, but maybe she'll get lucky.
Either way if the prospectus/plan was reasonable I would do it. Right now it would be worth it to me for $100,000 in profit.
Salaries are going down and maybe dispensing will no longer require a pharmacist. A $100,000/ year for someone with a worthless doctoral degree isn't so bad. No? (BTW the italics is NOT said in amusement. It is what I think would be the best place in the worst case. My best case is way better than that)