Can't say iv'e had that particular experience, but i've been given or forced to take pills or injections by all sorts of very bizarre beings or aliens in dreams. Once in a while though i find myself lucid later in the dream but i don't know if theres really a connection since i lucid dream fairly often anyways. It might just be a sort of self-suggested thing you have going on; you get the injection and think you won't lucid dream because of it, and you end up not lucid dreaming like a sort of self-fulfilling prophecy. I don't know really
harmalas and melatonin though do help me enter lucid dreams btw
<Ringworm>hehehe, it's all fun and games till someone loses an "I"