Patient: Description: Grey nails caused by nail trauma after having a baby in March 2009. I visited the dermatology department of Changhai Hospital on May 22, 2009, but I am breastfeeding, can I take Spironolactone and what is the dosage each time? Hospital Dermatology: Grey nail or onychomycosis is a chronic disease that usually has a relatively long course, so the diagnosis should be clear first. For treatment, Spironol is usually based on shock therapy, but you are breastfeeding, so you can hold off for a while.