Could Isotretinoin Shorten Adult Height?

Analyses by treatment timing, cumulative dose, and stunting supported the overall finding, though early-initiation and female subgroup data were limited.

By
Kathryn Wighton
June 4, 2026
6 min

Conexiant

Overview

A nationwide Danish study involving 379,196 individuals found no clinically meaningful reductions in adult height associated with adolescent isotretinoin treatment for acne, specifically addressing concerns in this population. The findings provide reassurance regarding the safety of isotretinoin in relation to growth.

Background

Concerns about isotretinoin's potential impact on growth have persisted among clinicians and patients, particularly regarding its use in adolescents. Understanding whether isotretinoin affects adult height is crucial for informed decision-making in acne management. This study addresses these concerns with robust data from a large population.

Data Highlights

Group	Adjusted Mean Height Difference (cm)
Men (Isotretinoin Users)	0.3
Women (Isotretinoin Users)	0.3
Men (Reference Group)	180
Women (Reference Group)	168

Key Findings

No clinically meaningful height reduction was observed in isotretinoin users compared to non-users.
Adjusted mean height differences were 0.3 cm for both men and women, below the 5 cm threshold for clinical relevance.
Height differences remained insignificant across various age at first isotretinoin prescription and cumulative dose analyses.
Stunting prevalence was slightly lower in isotretinoin users (1.5%) compared to the reference group (2.1%), but this should not be interpreted as a protective effect; it may reflect differences in health care access.
Height was measured by medical staff, enhancing the reliability of the outcome data.
Findings support the absence of a dose-response relationship between isotretinoin exposure and adult height.

Clinical Implications

These findings may alleviate concerns regarding growth impairment in adolescents treated with isotretinoin for severe acne. Clinicians can confidently prescribe isotretinoin, focusing on its benefits for acne management while engaging in shared decision-making with patients and families.

Conclusion

The study provides strong evidence that isotretinoin does not adversely affect adult height, reinforcing its safety profile in adolescent acne treatment. However, caution is warranted in interpreting results, particularly regarding early initiation of treatment. This knowledge can guide clinical practice and patient discussions.