Al-jawab billahi at-taufeeq (the answer with Allah’s guidance)
The alcohol used in perfumes or deodorants is normally a synthetic alcohol, which is not impure (Najis) and will be permissible for external use. However, its oral intake is still impermissible except in the cases of necessary medication.
If the alcohol is from grapes or dates extract, then this will be impure (Najis) and Haram.
Abu Huraira (RadhiAllahu Ta’ala Anhu) reported Allah’s Messenger (Sallallahu Alaihi Wasallam) having said: Wine is prepared from the (fruit) of these two trees date-palm and vine. (Muslim, The Book of Drinks)
Ibn ‘Umar (RadhiAllahu Ta’ala Anhu), through another chain of transmitters; reported Allah’s Messenger (Sallallahu Alaihi Wasallam) having said this: Every intoxicant is Khamr and every intoxicant is forbidden. (Muslim, The Book of Drinks)
And Only Allah Ta’ala Knows Best.
Moulana Qamruz Zaman