If the reason for hairfall is not excess testosterone than even few weeks of DHT inhibitor can cause Impotence.
You do realise than in countries like Pak and probably Ind & Bd aswell DHT inhibitor can be bought wuthout prescription.
کچھ بال واپس آجائیں گے اور کچھ گرنے بھی کم ہوجائیں گے مگر بیڑا پار ہوجائے گا
Even if you have high Testosterone even than chronic use which is necessity to keep control results in impotence in longterm.
In Pakistan DHT inhibitor spray is not available which has lesser side effects becsuse lesser DHT inhibitor is available in systenic circulation and major part binds to receptors present in scalp. Even long term spray use can be detrimental sexually but much safer than tablets.
Another thing with DHT spray aswell as Minoxidil aswell is wothdrawl effects. Once you stop using them you experience more hairfall than what was the case previously.
So the best option if one doesn't have a big " katora " is 3-5 sessiona of Mesotherapy + PRP and not the hair transplant. In Pakistan it is much much cheaper. But life permitting final results would take 6 months to1 year and the looks would be more natural than transplant. And than frequent use of minoxidil spray along with balanced diet rich in vitamins for maintenance.
Shoaib Malik is a classical example.