Does Methylphenidate Reduce Testosterone Levels in Humans? A Prospective Study in Children with
Liang-Jen Wang1, Miao-Chun Chou1, Wen-Jiun Chou1
1Department of Child and Adolescent Psychiatry, Kaohsiung Chang Gung Memorial Hospital and Chang Gung University College of Medicine, Kaohsiung, Taiwan; Department of Psychiatry, Kaohsiung Chang Gung Memorial Hospital and Chang Gung University College of Medicine, Kaohsiung, Taiwan; Department of Psychiatry, Kaohsiung Veterans General Hospital, Kaohsiung, Taiwan; Department of Psychiatry, College of Medicine and Hospital, National Cheng Kung University, Tainan, Taiwan.
Insights
Short-term methylphenidate treatment for attention-deficit/hyperactivity disorder (ADHD) did not significantly affect testosterone levels in children. Further research is needed to explore long-term effects on reproductive health.
Area of Science:
- Pediatric Endocrinology
- Neurodevelopmental Disorders
- Pharmacology
Background:
- Previous research suggested methylphenidate may negatively impact gonadal hormones.
- This study investigated the effect of methylphenidate on testosterone levels in children with ADHD.
Purpose of the Study:
- To determine if methylphenidate treatment alters testosterone levels in children diagnosed with attention-deficit/hyperactivity disorder (ADHD).
- To compare testosterone levels in ADHD patients with and without methylphenidate treatment.
Main Methods:
- A 4-week prospective study in Taiwan involving 203 children with ADHD.
- Salivary testosterone levels were measured at baseline and 4 weeks using chemiluminescence immunoassay.
- Participants were divided into a medicated group (n=137) and a nonmedicated group (n=66).
Main Results:
- Salivary testosterone levels showed no significant changes in either the medicated or nonmedicated groups over the 4-week study period.
- Adjusting for age and sex did not alter the findings of unchanged testosterone levels.
- No significant correlation was found between methylphenidate dosage and changes in testosterone levels.
Conclusions:
- Short-term methylphenidate use at standard doses does not appear to significantly impact testosterone levels in pediatric ADHD patients.
- Long-term effects of methylphenidate on testosterone production and reproductive function warrant further investigation.
Background:
Animal studies and case reports have suggested that methylphenidate exerts adverse effects on gonadal hormones. This study aimed to determine whether methylphenidate alters testosterone levels in children with attention-deficit/hyperactivity disorder through comparison of those with or without methylphenidate treatment.
Methods:
This 4-week, nonrandomized, prospective study conducted in Taiwan included 203 attention-deficit/hyperactivity disorder patients with a mean age of 8.7 years (boys: 75.8%). After the initial recruitment, 137 received daily methylphenidate treatment (medicated group) and 66 were assessed through naturalistic observation (nonmedicated group). The saliva samples of attention-deficit/hyperactivity disorder patients were used to quantify testosterone levels at baseline and the endpoint by using the chemiluminescence immunoassay. At the 4th week, 86 patients in the medicated group and 46 patients in the nonmedicated group were eligible for statistical analyses.
Results:
During the study period, salivary testosterone levels did not significantly change in the medicated group (P=.389) or in the nonmedicated group (P=.488). After correction for the potential confounding effects of age and sex, salivary testosterone levels still remained unchanged in the medicated and nonmedicated groups during the 4-week follow-up. In the medicated group, changes in salivary testosterone levels over 4 weeks were not significantly correlated with the methylphenidate daily dose (mean daily dose: 18.1 mg).
Conclusions:
Findings suggest that short-term treatment with methylphenidate at usual doses does not significantly alter salivary testosterone levels in attention-deficit/hyperactivity disorder patients. Future studies should clarify whether long-term methylphenidate treatment disrupts testosterone production as well as the function of the reproductive system.
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