Ritalin and SSRI anti-depressants can increase or even cause stuttering in children and adults. For more information download our free e-book Medications for Stuttering.
Check the dosage. Adults usually take around 300mg of thiamin. Take magnesium with thiamin. 300mg is usually what adults take. Get a nutrition test such as the Spectracell Micronutrient Panel. Stop consuming vegetable oil (canola, corn, soy, safflower, sunflower), caffeine, and chocolate.
No prescription medications have been found to have more than marginal effects on stuttering. Many have side effects, sometimes severe. For more information see our free e-book Medications for Stuttering. Thiamin and magnesium have been proven effective in two small studies. For more information see our blog post Should Stutterers Take Vitamin B-1?