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 (9 June 1781 - 12 August 1848) a British civil engineer and mechanical engineer who built the first public railway line in the world to use steam locomotives and is known as the Father of Railways   Trevithick invented the first train, Stephenson the first public railway line.he Diesel engine was invented by Rudolf Christian Karl Diesel, a German inventor born in France. He designed a single 3 m iron cylinder with a flywheel at its base which ran â¦ on its own power for the first time in Augsburg, Germany on 10 August 1893.