I doubt it is available in pill form, and hopefully it isn’t available in any form to anyone other than a select few research scientists, platypus venom causes excruciating pain, but isn’t lethal to humans. The pain can last for months, but usually last days to months. It doesn’t contain a necrotizing component like snake venom, but there will be swelling at the point of entry. Taken in pill form, I have no idea how it would affect a person vs. entering the bloodstream directly.
There are no known cases of fatalities from platypus venom.