Aa
A
A
Close
Avatar universal
how long does pegintron stay in the body?
I read that it stays in the body for 5-7 days and your level may be 0 before your next weekly injection. Does anyone know for sure?
Thanks,
Dave
Cancel
2 Answers
Page 1 of 1
338734 tn?1377163768
I think it depends on some individual factors, particularly renal clearance of the drug. I found this information in the drug reference:

According to the manufacturer's tests, the drug reaches maximum serum levels between 15 and 44 hours after subcutaneous injection of a single dose. The mean elimination half-life is 22 to 60 hours (mean = 40 hours). So, I would expect that after 7 days (4.2 half-lifes) that the concentration would be about 5.5% (0.5^4.2) of the maximum levels.

From the published pharmokinetic studies on Pegintron:
-----------------------------------------------------------------------------------
Pharmacokinetics
Following a single subcutaneous dose of PegIntron, the mean absorption half-life (t ½ ka) was 4.6 hours. Maximal serum concentrations (Cmax) occur between 15 and 44 hours post dose, and are sustained for up to 48 to 72 hours. The Cmax and AUC measurements of PegIntron increase in a dose-related manner. After multiple dosing, there is an increase in bioavailability of PegIntron. Week 48mean trough concentrations (320 pg/mL; range: 0, 2960) are approximately 3-fold higher than Week 4 mean trough concentrations (94 pg/mL; range: 0, 416). The mean PegIntron elimination half-life is approximately 40 hours (range: 22-60 hours) in patients with HCV infection. The apparent clearance of PegIntron is estimated to be approximately 22mL/hr·kg. Renal elimination accounts for 30%of the clearance.

Pegylation of interferon alfa-2b produces a product (PegIntron) whose clearance is lower than that of nonpegylated interferon alfa-2b. When compared to INTRON A, PegIntron (1 mcg/kg) has approximately a 7-fold lower mean apparent clearance and a 5-fold greater mean half-life, permitting a reduced dosing frequency. At effective therapeutic doses, PegIntron has approximately 10-fold greater Cmax and 50-fold greater AUC than interferon alfa-2b.
Comment
Cancel
Comment
Avatar universal
Comment
Comment
Submit Comment
338734 tn?1377163768
P.S. The concentrations of Pegintron at 7 days post injection (the trough) would be lower early in the TX period and higher later in the TX period.
Comment
Cancel
Comment
Avatar universal
Comment
Comment
Submit Comment
Your Answer
Avatar universal
Answer
Know how to answer? Tap here to leave your answer...
Answer
Submit Answer
A
A
Recent Activity
317787 tn?1468754865
Blank
Dee1956 NEW SURVEY, top of page, pl... Comment
17 hrs ago
317787 tn?1468754865
Blank
10356, and Dee1956 commented on VICourageous's status
19 hrs ago
406584 tn?1399591666
Blank
10356 commented on stilltrying1965's status
19 hrs ago
Blank
Weight Tracker
Track your weight over time
Start Tracking Now
Top Hepatitis Answerers
317787 tn?1468754865
Blank
DC
163305 tn?1333672171
Blank
Rural Mural, CA
446474 tn?1446351282
Blank
San Francisco, CA
Avatar universal
Blank
1747881 tn?1358189534
Blank
Greeley, CO
2059648 tn?1439770265
Blank
Hepatitis C Community Resources