Hi @jmla I'm taking Forteo, an almost same drug as Tymlos, although forteo only has one dose which is 20mcg. Our ht and wt are similar though I am just a bit heavier than you so I thought to give you what I experienced. For the first month and a half, I experienced low blood pressure all day long, as low as 80/50, which made me not wanting to get out of bed and lots of fatigue during the day. I didn't do much of exercise either during that period. I didn't experience headache or tachycardia. Low blood pressure is a known side effect of pth and tachycardia could occur as a compensatory mechanism. So you might to check your blood pressure. My endo asked me to drink 10-12 cups of water daily, and if needed, adding some salt to water. Gradually my body got used to the med and second month was a lot better! Now I didn't feel anything. Hope this helps