Lying would be for me not an option - we are talking about someone else's life here.

Your motivation for donating blood and plasma should be for ethical reasons and a wish to help. It floors me that someone would do so for the sole reason of money. Perhaps you should evaluate your reasons for doing so. If you are doing so out of a sense of moral duty or need to help you wouldn't be feeling the need to lie - which in such a situation is incredibly self-serving and immoral.

I have an additional idea to point out here. Your medications may not permit you to donate in the first place. If you are the type to not disclose this? I am left speechless.