The Peptide CommonsEst. May 2024
Independent. We sell nothing and are affiliated with no manufacturer or pharmacy. Every moderation action is logged in public
Safety · Contraindications

Revisiting: Absolute versus relative contraindications

NN
n.nybergTL2 Moderator26 Dec 2025#1

Revisiting: Absolute versus relative contraindications — setting out what I have, and where I think it stops being reliable.

Asking about a population rather than about a person.

The published trials in this class mostly enrolled a fairly specific group, and the questions here frequently come from people well outside it. I would like to understand what the honest position is when someone falls outside the studied population: not "it is fine" and not "there is no data", but what the reasoning actually looks like.

15 likes 7mo
PA
p.amankwahTL2 Moderator30 Dec 2025#2

I disagree with the reply above, and I think the disagreement is substantive rather than terminological.

The distinction being drawn does not survive when you look at the published data for this specific question. I would be glad to be shown wrong on this, because the version I am arguing against is more convenient.

2 likes 7mo
IC
i.coelhoTL2 Moderator2 Jan 2026#3

Disordered eating history: appetite suppression can trigger relapse in people with history of anorexia, bulimia, or other eating disorders. This is a relative contraindication requiring specialist input.

0 likes 7mo
DP
d.petrescuTL2 Moderator5 Jan 2026#4

post #3 is right about the mechanism and I think understates the practical bit.

Pregnancy: these compounds are not approved for pregnancy. The potential risks outweigh potential benefits. Planning windows and washout (several months) are the standard approach.

26 likes 7mo
JH
j.hartmannTL2 Moderator8 Jan 2026#5

Medullary thyroid carcinoma (personal or family history) or multiple endocrine neoplasia type 2: absolute contraindication. The rodent preclinical signal is real enough to exclude this population.

12 likes 7mo
K
KnowltonTL3Regular10 Jan 2026#6

Allergy to the specific compound: true allergy is rare but possible. Any prior allergic reaction to the same compound or to structurally similar peptides warrants caution.

4 likes 7mo
SA
s.achebeTL212 Jan 2026#7
V
VThorvaldsenTL3Regular14 Jan 2026#8
s.achebe, post #7: On post #3 — agreed on the reasoning, with one qualification. Practical note that does not fit anywhere else. Whatever you conclude from this topic, write down what you did and when. The single most useful thing in your own records is not any individual result; it is that they are dated and consecutive. Go to post

post #7 answers the question as asked. The question underneath it is different.

Gastroparesis or severe delayed gastric emptying: these compounds slow gastric emptying. Pre-existing severe gastroparesis can be worsened. That is a relative contraindication depending on baseline severity.

0 likes in reply to #7 6mo
KA
k.agyemanTL2 Moderator16 Jan 2026 · edited#9
VThorvaldsen, post #8: post #7 answers the question as asked. The question underneath it is different. Gastroparesis or severe delayed gastric emptying: these compounds slow gastric emptying. Pre-existing severe gastroparesis can be worsened. That is a relative contraindication depending on baseline severity. Go to post

Concurrent insulin or sulfonylureas: not an absolute contraindication but requires dose adjustment and close monitoring for hypoglycemia. The combination is used with caution, not avoided.

2 likes in reply to #8 6mo
NT
n.torrenceTL3Regular18 Jan 2026#10
s.achebe, post #7: On post #3 — agreed on the reasoning, with one qualification. Practical note that does not fit anywhere else. Whatever you conclude from this topic, write down what you did and when. The single most useful thing in your own records is not any individual result; it is that they are dated and consecutive. Go to post

This follows post #7 rather than contradicting it.

Severe renal impairment (eGFR <15): these compounds are renally cleared and accumulate in severe kidney disease. Risk-benefit is unfavourable without dose adjustment.

0 likes in reply to #7 6mo
AP
au.pereiraTL2 Moderator20 Jan 2026 · edited#11
p.amankwah, post #2: I disagree with the reply above, and I think the disagreement is substantive rather than terminological. The distinction being drawn does not survive when you look at the published data for this specific question. I would be glad to be shown wrong on this, because the version I am arguing against is more convenient. Go to post

This follows post #8 rather than contradicting it.

Diabetic retinopathy complications: a signal for this was noted in SUSTAIN 6. Current evidence is mixed. The risk is not zero and some caution is appropriate in people with baseline retinopathy.

11 likes in reply to #2 6mo
MM
maintenance_modeTL3Regular22 Jan 2026#12

Practical note that does not fit anywhere else. Whatever you conclude from this topic, write down what you did and when. The single most useful thing in your own records is not any individual result; it is that they are dated and consecutive.

24 likes 6mo
AI
a.ilungaTL2 Moderator24 Jan 2026#13

Severe hepatic impairment: less is known than for kidney disease. Extreme caution or contraindication depending on the specific degree of impairment.

0 likes 6mo
LE
logbook_erinTL3Regular26 Jan 2026#14

Concurrent insulin or sulfonylureas: not an absolute contraindication but requires dose adjustment and close monitoring for hypoglycemia. The combination is used with caution, not avoided.

1 like 6mo
PK
p.krastevTL2 Moderator28 Jan 2026#15
logbook_erin, post #14: Concurrent insulin or sulfonylureas: not an absolute contraindication but requires dose adjustment and close monitoring for hypoglycemia. The combination is used with caution, not avoided. Go to post

Picking up post #12: that is the part I would want checked first.

I disagree with the reply above, and I think the disagreement is substantive rather than terminological.

The distinction being drawn does not survive when you look at the published data for this specific question. I would be glad to be shown wrong on this, because the version I am arguing against is more convenient.

17 likes in reply to #14 6mo
IS
isotonic_sheetTL3Regular30 Jan 2026#16

Coming back to post #14, because the follow-up matters more than the original answer.

Medullary thyroid carcinoma (personal or family history) or multiple endocrine neoplasia type 2: absolute contraindication. The rodent preclinical signal is real enough to exclude this population.

33 likes 6mo
KP
k.pereiraTL2 Moderator1 Feb 2026#17

Severe renal impairment (eGFR <15): these compounds are renally cleared and accumulate in severe kidney disease. Risk-benefit is unfavourable without dose adjustment.

0 likes 6mo
RV
r.venkatesanTL3Wiki editor2 Feb 2026#18
logbook_erin, post #14: Concurrent insulin or sulfonylureas: not an absolute contraindication but requires dose adjustment and close monitoring for hypoglycemia. The combination is used with caution, not avoided. Go to post

Severe hepatic impairment: less is known than for kidney disease. Extreme caution or contraindication depending on the specific degree of impairment.

3 likes in reply to #14 6mo
HV
h.vargaTL2 Moderator4 Feb 2026#19

Pregnancy: these compounds are not approved for pregnancy. The potential risks outweigh potential benefits. Planning windows and washout (several months) are the standard approach.

4 likes 6mo
VS
v.szaboTL3Analytical chemist6 Feb 2026 · edited#20

Disordered eating history: appetite suppression can trigger relapse in people with history of anorexia, bulimia, or other eating disorders. This is a relative contraindication requiring specialist input.

12 likes 6mo
EL
e.lokkenTL2 Moderator8 Feb 2026#21
j.hartmann, post #5: Medullary thyroid carcinoma (personal or family history) or multiple endocrine neoplasia type 2: absolute contraindication. The rodent preclinical signal is real enough to exclude this population. Go to post

Diabetic retinopathy complications: a signal for this was noted in SUSTAIN 6. Current evidence is mixed. The risk is not zero and some caution is appropriate in people with baseline retinopathy.

18 likes in reply to #5 6mo
AF
a.friskTL2 Moderator9 Feb 2026#22
e.lokken, post #21: Diabetic retinopathy complications: a signal for this was noted in SUSTAIN 6. Current evidence is mixed. The risk is not zero and some caution is appropriate in people with baseline retinopathy. Go to post

This follows post #19 rather than contradicting it.

History of pancreatitis: these compounds can rarely trigger pancreatitis. History of pancreatitis increases relative risk. That is a relative contraindication, not absolute, but requires monitoring.

7 likes in reply to #21 6mo
TN
t.ndiayeTL2 Moderator11 Feb 2026#23

Two things before anyone answers the substance.

First, the context in the first post is clear and specific. Second, the question is framed so that an answer can actually address it. Both are the norm here and both matter more than they sound.

0 likes 5mo
TD
t.demirTL2 Moderator13 Feb 2026#24

Gastroparesis or severe delayed gastric emptying: these compounds slow gastric emptying. Pre-existing severe gastroparesis can be worsened. That is a relative contraindication depending on baseline severity.

0 likes 5mo
K
KTurkingtonTL3Regular14 Feb 2026#25
i.coelho, post #3: Disordered eating history: appetite suppression can trigger relapse in people with history of anorexia, bulimia, or other eating disorders. This is a relative contraindication requiring specialist input. Go to post

Allergy to the specific compound: true allergy is rare but possible. Any prior allergic reaction to the same compound or to structurally similar peptides warrants caution.

12 likes in reply to #3 5mo
EM
e.mwangiTL2 Moderator16 Feb 2026#26

Picking up post #23: that is the part I would want checked first.

Gastroparesis or severe delayed gastric emptying: these compounds slow gastric emptying. Pre-existing severe gastroparesis can be worsened. That is a relative contraindication depending on baseline severity.

4 likes 5mo
TI
trough_indexTL3Regular17 Feb 2026#27

Medullary thyroid carcinoma (personal or family history) or multiple endocrine neoplasia type 2: absolute contraindication. The rodent preclinical signal is real enough to exclude this population.

0 likes 5mo
AN
a.norgaardTL2 Moderator19 Feb 2026#28

Allergy to the specific compound: true allergy is rare but possible. Any prior allergic reaction to the same compound or to structurally similar peptides warrants caution.

26 likes 5mo
TD
t.dumitruTL2 Moderator21 Feb 2026#29

I read post #27 twice before replying, because I had assumed the opposite.

Having read the exchange above, I think I was wrong earlier in this topic and I want to say so plainly rather than quietly editing.

The correction was fair and I had been repeating something I had not checked carefully enough.

8 likes 5mo
C
chromatogramTL4Analytical chemist22 Feb 2026#30
t.ndiaye, post #23: Two things before anyone answers the substance. First, the context in the first post is clear and specific. Second, the question is framed so that an answer can actually address it. Both are the norm here and both matter more than they sound. Go to post

Pregnancy: these compounds are not approved for pregnancy. The potential risks outweigh potential benefits. Planning windows and washout (several months) are the standard approach.

2 likes in reply to #23 5mo