Flutemide is coming into use as an antiandrogen with transgender women. It's reportedly a descent antiandrogen, however there are serious concerns with the liver for that particular drug. Please note the following warning that comes up on drugs.com for it:
Flutamide may cause serious, even life-threatening, liver problems. Tell your doctor if you have a history of liver disease. Notify your doctor immediately if you develop nausea, vomiting, stomach pain, loss of appetite, fever, yellowing eyes or skin, dark urine, or unusual fatigue. Laboratory tests (eg, liver function tests) should be performed before and during use of flutamide. Your doctor will be monitoring your treatment closely.
Also note, it is not recommended for use by women.
I havent personally used the drug, but I know several on reddit in the trans community have. It's also reportedly VERY expensive. If no one has used it here, you can try asking here:https://www.reddit.com/r/asktransgender/