My daughter is 23 months. I gave been giving her the infant and children cough and cold medication DPH. However I just realized than 5am on sat morning and 7pm last night I mixed up the two bottle and gave her the Adult and children bottle which contains 15mg of Dextromorphan instead of 3.75 in the infant one. I am worried about an overdose in the last 48 hours as she was also given two doses today of the proper medication for infant.

Call poison control for instructions. If you are in the US, the number is 1-800-222-1222