Gawd. I said that. A little late like an hour or two is fine, especially on an every 12 hours drug. But an antibiotic that is every 6 hours, if you take it 3 hours late, it’s a much bigger miss than an every 12 hours drug, because the half life on the every 6 hours is much shorter. If the dose is 500mg and that is just enough to bang out the bacteria, then it’s important to take it very well, but if 500mg will work, and your prescribed 875mg, then you get a little more leeway, because even if you’re late, you have a higher dose in your system. Believe me, usually doctors prescribe high, which guards against screw ups.
Doctors like to prescribe drugs that are every 12 hours, or once a day, because patients are better at being compliant, and being compliant with antibiotics is very important. Patients often take drugs that are 4 times a day, 4 times during waking hours, rather than setting an alarm to take the drug every 6 hours.
It sounds to me like you do give a damn about taking it correctly, and I have said that over and over, and I don’t know what your problem is.