yes, tamoxifen takes 36 days to reach stable blood levels so you using it for 4 days likely reached stable blood levels of 2mg of tamoxifen. Tamoxifen doesnt have antiestrogenic effects at 5mg and below. It doesnt even have an antiestrogenic effect until at least 10mg.
lmao yes u are losing hair because you came off of spironolactone, let me explain what happened.
1. Spironolactone has a half life of 12 hours, so after 2 days, its out of your body (4 half lives=out of body)
2. Spironolactone has two primary factors that contribute to its antiandrogenic activity:
- Androgen receptor partial agonism: Spironolactone binds to the androgen receptor and causes it to express much more weakly than if an androgen such as testosterone or DHT had bound to it.
- 17α-hydroxylase and 17,20-lyase inhibition: These two enzymes are key in the production of androgens.
When those 2 enzymes are inhibited, since they are involved in the CYP17A1 pathway production of androgens, luteinizing hormone increases in the body to compensate for the lowered production of androgens.
So now that you are off spironolactone, 1. the increased LH is having a detrimental effect on your hair since you have a higher LH level than you did before you started spironolactone, and the increased levels of LH are freely converting to Testosterone since no spironolactone metabolites are available to inhibit 17α-hydroxylase and 17,20-lyase. In addition, partial agonism is still present from when you started spironolactone so a higher level of androgens are flooding the nucleus.
This means that you now have higher testosterone levels than you did before starting spironolactone.
You can think of this as AR Upregulation in a sense.
I hope you liked this, I spend like 15 minutes brainstorming this and graphing it on paper lmao
