Does Dilantin cause Erectile Dysfunction?

Patient : I have been taking Dilantin (Phenytoin) for about 25 years. In the last several years I've experienced bouts of erectile dysfunction. I exercise regularly, I'm not overweight, don't smoke or have diabetes (no other indicators for ED). I spoke with my neurologist about whether Dilantin caused ED but she said it didn't. (she even consulted with her colleagues). With the wealth of sources on the internet that say Dilantin is a cause of ED(WebMD, AAFP, HealthCentral, MedicineNet) I'd like to know your opinion. Does Dilantin cause ED?
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