Tehran University of Medical Sciences Auditory and Vestibular Research 2423-480X 27 3 2018 07 08 150 156 EN Seyyed Mohammad Reza Taghavi Department of Audiology, School of Rehabilitation, Tehran University of Medical Sciences, Tehran, Iran Ahmad Geshani Department of Audiology, School of Rehabilitation, Tehran University of Medical Sciences, Tehran, Iran Nematollah Rouhbakhsh Department of Audiology, School of Rehabilitation, Tehran University of Medical Sciences, Tehran, Iran Shoreh Jalaie Biostatistics, School of Rehabilitation, Tehran University of Medical Sciences, Tehran, Iran Akram Pourbakht Department of Audiology, School of Rehabilitation Sciences, Iran University of Medical Sciences, Tehran, Iran Abbas Kebriaeezadeh Department of Pharmacoeconomics and Pharmaceutical Administration, School of Pharmacy, Tehran University of Medical Sciences, Tehran, Iran Mohammadsaleh Moosapour Bardsiri Department of Audiology, School of Rehabilitation, Tehran University of Medical Sciences, Tehran, Iran 2018 01 29 2018 04 28 Background and Aim: Caffeine consumes targeted attention to the signal, which is expected to lead to increased noise tolerance and ultimately improved speech perception. In the current study, the effect of short-term caffeine consumption on speech and noise simultaneous reception function was evaluated using acceptable noise level (ANL) test. Methods: In this interventional double-blind study, 90 cases (45 male, 45 female) aged 18−34 years were randomly assigned into three groups: the test groups, 3 and 5 mg/kg caffeine, and the control group, just placebo. The ANL test was recorded before and one hour after intervention. The results were compared before and after taking caffeine in three groups. Results: The statistical analysis revealed that there was significant difference in ANL result in dose 3 mg/kg caffeine before and one hour after intervention (p=0.043) and there was a significant difference in ANL result in dose 5 mg/kg caffeine before and one hour after intervention (p=0.001). Also, there was a significant difference in ANL before and one hour after taking caffeine between the group receiving 3 mg/kg dose of caffeine and the 5 mg/kg dose of caffeine (p=0.015). Conclusion: According to the findings of the study, after an hour of caffeine consumption, the ANL decreases. In other words, the individuals tolerate higher levels of speech noise. This is also dependent on the dose of caffeine. https://avr.tums.ac.ir/index.php/avr/article/view/699 https://avr.tums.ac.ir/index.php/avr/article/download/699/286