Used it a on 2 occasions at 1-2mg ed, each time I have experienced ED at around week 10-12. Luckily each time it bounced back 2 weeks after ceasing Finasteride.
Since then I've switched to Dutasteride at 0.5mg e2d, been on it for months now, no issues so far.
One more thing, do not take 5α-reductase inhibitors with nandralone, as it will only accelerate hair loss.