Yes, ZIDOVUDINE is a Scrabble word!

Letter values in Scrabble US: Z 10, I 1, D 2, O 1, V 4, U 1, D 2, I 1, N 1, E 1.

Is it a valid word?

ZIDOVUDINE is a valid word in the official Scrabble dictionary (US), the UK Scrabble Dictionary and Words with Friends (ENABLE).

an antiviral drug (trade name Retrovir) used in the treatment of AIDS; adverse side effects include liver damage and suppression of the bone marrow

Not playable in Scrabble US: RETROVIR, ZDV, AZT.