RE: Simpson Mending Plate for custom made wood truss. I think boo1 pretty welled summed it up. Based on experience my opinion would be that the liability you would be taking on if you try to show that the mend plates work, would be too high.
Isoniazid is often used as a protective treatment to reduce the risk of TB. D100 might be a medicine called doxycycline, which is a drug used to treatment many different things. Please ask your doctor or pharmacist to talk about this. These people will help you understand your medicine and what it is being used for.
Metronidazole is an antibiotic that is used to treat a wide variety of infections. It works by stopping the growth of certain bacteria and parasites. This antibiotic treats only certain bacterial and parasitic infections. It will not work for viral infections (such as common cold, flu). Using any antibiotic when it is not needed can cause it to not work for future infections. Metronidazole may also be used with other medications to treat certain stomach/intestinal ulcers caused by a bacteria (H. pylori).