Good to know! I believe the Tamoxifen manufactured by Dr Reddy’s Lab I received was not the dose as marked (higher), or it was some other drug.
I have been on tamoxifen since 2022. Started at 20 mg, by about 7 months later I was taking 5 mg daily, after trying 10 mg and a drug holiday. As far as I can tell, and I have pretty accurate records, I’d never been given tam from Dr Reddy before last July. I started having intense warm flashes, developing varicose veins in legs, more darker face hair, and more wrinkled upper arm skin. (I have had very little side effects with the 5 mg.) I had been on Dr Reddy’s for about 6 weeks by then. By 8 weeks, I switched back to taking some old 20 mg tablets that I cut. Didn’t know if they were still good, they mark all prescription drugs expired at one year (unless it comes in the original manufacturers bottle). But it was a vacuum sealed bottle, I had left over when I switched.

I then had a regular appointment with my general practitioner, and she said my symptoms were all over the place, and didn’t think I could attribute it to the tamoxifen manufacturer. I didn’t realize until later, that yeah, my symptoms would be all over the place because the dose was disrupted for 2 months and then I was back on my usual dose. I went through changes like taking a high dose, then changes when it went back to 5.

I also discussed this with my brother, a retired general surgeon with emergency and burn specialty. He also dismissed my concern, So I didn’t contact the cancer center - you know, it’s really difficult to get physicians to act on these menopause type symptoms. I will bring it up at my upcoming cancer follow up. But at this point, I told my pharmacy I don’t want Dr Reddy's Lab tamoxifen, and they’ve filled it elsewhere.

I don’t think Teva can do anything about Dr Reddy’s Lab, it looks like Teva actually divested certain drugs - and licenses were sold to Dr Reddy’s and also the manufacturer that makes what I use now, Aurobindo Labs. I also had no trouble with Maine Pharma Labs, but the two major pharmacy chains near me can no longer get tamoxifen from them. They tell me options are difficult right now, and they have to search for where they can get pharmaceuticals every month. Supply chains are a mess. Teva is an Israeli company, Dr Reddy’s Lab and Aurbindo Labs are in India.
But it’s good to know that Teva has a reporting site, maybe I can find similar with the other manufacturers.