Also if medication isn’t scored, doesn’t have a dividing line all the medication may be in one half and the other half is just fillers.
I learned this in Nursing school many moons ago!
Definitely run it by your medical team.
Good Luck, Let us know what they recommend.
Sending you love and prayers for a reduction in the side effects you are experiencing. 💕

I was told to take my Letrozole pills in the morning so it would be less likely to make my insomnia worse. My insomnia is still worse.

Before splitting any cancer or non cancer related pills in half you need to check with your doctor and your pharmacist to make sure it is safe. It's important to double check with the pharmacist because they know more about medications than doctors do. It's fairly common for doctors to prescribe medications to people without taking into account the effect a new medication will have on the existing medications that the patient is already taking. This has happened to me a bunch of times over the years.

Some pills shouldn't be broken or altered in any way because it will have a negative effect on how the medication is absorbed by your body and it can be harmful to your health. This is especially true for pills that are designed to be time released over an extended period of time/hours because you can poison/overdose yourself if your body receives too much of the medication at one time. For example my CDK inhibitor is Ibrance. The packaging says if the coating of the pill has been damaged or the pill has been broken that you shouldn't take that damaged pill. My oncologist said this is because the medication will be released into the body too quickly with Ibrance.