$0 Co-Pay $0 Co-Pay on Sustiva® prescriptions for most eligible patients. Call to sign up for the Co-Pay Assist Program. The program will cover up to $7,500 per year with no monthly limit. You Might Also Like Instant Rebate Card December 30, 2021 Save $1 July 2, 2018 Pay As Little As $0 June 29, 2018