How about taking half of the pill in that case if you say 8mg may be enough ?
Btw, does entencavir may have also similar impact on the muscles or it's rather only tdf/taf issue ? It's possible that I will start entencavir depending on my results 6 months after interferon and I'd like not to limit my gym activity which is quite high.
This CK elevation is so serious that it requires an effort to clarify if the TAF is the culprit or not.
At first I would retest the CK after giving your muscles acres for a week, better two. You can retest on your own by using directlabs without a doctors orders. They also charge very low fees.
If it still is quite high, like from 400 to 800 iu, then we must suspect that TAF is too much incorporated in your muscle tissue, causing damage.
To validate this suspicion, I would then switch for one month to good old viread or entecavir, then retest. If now low and fairly normal, always considering your exercise schedule, the TAF hypothesis will substantially strengthen. Best test again after one week of rest.
Then you can restart TAF and see if the damage reappears after several weeks.
For your understanding, while TAF is very very mild on the kidneys compared with viread, it remains in the bloodstream much longer in a form in which it can penetrate the cell membrane of most tissues, increasing the final effective uptake substantially.
While the total dose of 25mg is much lower than viread s 300mg, the total uptake into muscle might still be higher due to the long availability of the drug to enter muscle tissue. Inside the muscle cells TAF will be converted to tenofovir diphosphate, just like it is with viread.
This is all of great importance and bears on the question of long term side effects with TAF. While it seems at this time that TAF is better tolerated than TDF =viread, certainly for the kidneys, the question of the collateral body burden has not really been addressed by Gilead's human trial in hbv.
The dose of 25mg was chosen high despite the fact that the phase 2 trial has clearly shown, that 8mg was equally effective in reducing the viral load.
The company likely wanted to avoid any risk that the lower dose might have lead to some patients having partial resistance problems, threatening the huge effort of the phase 3 trial to become futile.
The truth is the 25mg dose might be unnecessary high and causing avoidable side effects in other tissues, that might be hard to spot, but in a patient with intense muscle workout the problem suddenly surfaces.
The sessions re approval for TAF and the advisory Committee opinions seeing all the data from the phase 3 trial will hopefully shed some light on this.
Your CK is indeed very high, a sure sign of leakage of enzymes from damaged muscle fibers. While this can be caused by the weight bearing exercises it is further possible that there is extra sensitivity due to a neg effect of TAF on the muscles, adding to that rise.
Your AST ist high for the same reason and at least part of your ALT elevation will come from muscle tissue not the liver. ALT is an enzyme that is present in muscle fibers as well.
it would be good to compare CK values before and after the switch to TAF.
Just to mention, in your lab results it is CREATININE not creatine and the pH value refers to the urine, not the blood.
And after i've developed hbsab, took almost a year before the the elevated alt was lowered to 30. It seems like a very slow healing process. Just need to make sure elavated alt is not caused by others like fatty liver, hcc, cirrhosis, can be verify by test like, ultrasound, liver biopsy, fibroscan. Also one should be able to notice changes physically as the immune system gets stronger in fighting the hbv.
Here is my opinion on the result, low hbv dna and elevated alt could mean your immune system is responding to the virus as well, mine took 3 to 4 years of constant elevated alt before hbsag became non-reactive
Wanted to share some more, got results back after 6 months of TAF. Here is what I can share:
HBV DNA IU/mL: < 29 IU/mL HBV DNA Detected
Total Bili: 0.3mg/dL
Dir Bili : < 0.1 mg/dL
Ind Bili :< 0.3 mg/dL
AST (SGOT) - 92 (up 61 points)
ALT (SGPT) - 50 (down 15 points)
Creatine - 1.20 mg/dL
Uric Acid - 8.1 mg/dL (up 1.1 pts)
Calcium - 9.6 mg/dL
Phosphorus - 3.4 mg/dL
pH - 5.5 (down 1.5)
CK - 3642 U/L (This is very high - Thought is this was related to weight bearing training)
Parathyroid Hormone - 53.1 pg/mL (Falls within normal range)
HBsAg: Positive (Was hoping this changed but I think it's getting close. No HBsAg available here in the states and while the trial is supposed to measure it, it's for internal use only and unfortunately I do not have the finances to do this test on my own).
The big concern is the ALT and CK jump. Everyone has said this is due to weight bearing exercise. I find it hard to believe it would make my liver enzymes jump. Someone else mentioned this also happened to them when they went on TAFT a few months before losing HBsAg *which I hope is what is going on here* as the liver is now healing itself.
Hope everyone has a great day! :)