I was recently researching this exact issue, over night hikes are one thing, week hikes are another but I leave in june for a ME-GA thru hike and there was no way I could, or the men I'm going with deal with me on my period.. Pills make me very sick and I'm very sensitive to drugs so I discussed with my doctor the Mirana, an IUD.. It's only if your not looking for children in the next 5 years..It's incredible. I've had it for 2 weeks and I'm still dealing with the cramps randomly but haven't had any side effects and truly think it will be my favorite thing I've done to prepare for the trail. Truly something to look into!