I am often guilty of leaving out all the thoughts I am trying to convey when responding.
The reason I posted about the study was not to "rip on doctors" but to give OP and others that don't take all their antibiotics, a talking point to raise with their doctor the next time they get prescribed an antibiotic. While it might be for the wrong reasons, their habit of not taking all the antibiotics might actually be the correct course of action.
It is important to educate yourself because doctors are not to be placed on a pedestal. They are just highly educated but with an asterisk.
Studies have shown that if you need a procedure done, you will get a better outcome if the doctor performing it has done it many, many,many times. So you should seek out the most experienced.
Studies have also shown that if you have something that needs to be diagnosed, you actually want a younger doctor. Older doctors are often set in their diagnostic ways. They have seen that same set of symptoms dozens or hundreds of times in the past and immediately assume it is the same condition. Younger doctors have been shown to be both more open minded and have more up to date knowledge.
As to jet setting around Europe with a z pack from Mexico, I will assume the risk. The odds of my antibiotics purchased from a licensed pharmacy in Mexico being laced with fentanyl is near zero. The pharmacy I use displays their COFEPRIS registration number which can be easily verified and has a QFB on site that confers with each customer.