Each time when I visit my Pharmacy I used to come away with a different generic manufacture of Levothyroxine. Now it must be noted I don’t take this rubbish any more and moved to NDT.
I know the NHS conducted a review on the generic manufacture of Levothyroxine, but a lot of doctors and pharmacists are not happy about the generic meds esp hormones as they are so delicate and finite.
gov.uk/government/uploads/s... <-You can Jump to page 20 Overall Summary of Recommendations.
Note point 4. The introduction of a pharmacopoeial standard (Monograph) for levothyroxine oral solution drug products within the British Pharmacopoeia is recommended.
I would suggest you check your prescriptions and request the same brand each time, to mitigate any risks. I am certainly not a fan of knock offs. So why are knock offs allowed as meds esp when they are not even tested to the same standards as the original. Just Bioavailability.