Can I skip minoxidil or finasteride dosage once or twice a week? Would it cause trouble for my hair?

It won't be as effective if you start skipping doses. I suggest seeing a hair loss expert now to evaluate and go over your condition and provide you information about your best treatment options. There are great non-invasive options like prp/progesterone that work well with minoxidil and finasteride. See an expert. Best, Dr. Emer

The short answer to this question is No, you cannot skip.  Finasteride has a very short half life of only 6 hours.  This means it isnt even working for you in stopping your hair loss all day so adding additional time (another 24 hours) without medicine coverage will just allow your hair loss to continue unstopped. The same goes with minoxidil, every day you don't use it you are losing an opportunity to grow hair.There are however now more effective treatments available with much longer half lives on both the stopping and growing side that you could safely skip or miss a day or two.Search for a hair regrowth product that comes with a money back guarantee.

I dont think missing a single dose will have a great effect realizing that this drug takes months to a year to see real results. PRP is one of the new cutting edge treatments for hair loss and if you can find a plastic surgeon or other board certified derm, it may be worthwhile to check that out.