I was taking it 50 mg every six hours. But what has happened? I have missed the dose and I took two at once. I know that I should not do that and I don't know what I was thinking about while taking it but it has happened. I am afraid of overdose. How much of diphenhydramine is an overdose?
Quick Answer. The train was first invented and patented in 1784, by James Watt. The first working model to be made and successfully run was created in 1804 by Richard Trevithick. Continue Reading.
George Stephenson was the first inventor of the steam engine locomotive. He used the improvements of the steam engine itself, invented by James Watt, to make a better way of t â¦ ransportation. The purpose of this locomotive was make an easier way to transport and trade goods across the United States.he steam road Locomotive was invented by Richard Trevithick, but the first steam RAILWAY Locomotive was invented by George Stephenson. A Scottish inventor called William Murd â¦ och, made the first Locomotive Prototype. Hope this helps! 2 people found this useful.