Case Study: The purpose of this case study is to decipher properties of acid bas
ID: 796540 • Letter: C
Question
Case Study: The purpose of this case study is to decipher properties of acid based chemistry and how they adhere to LeChatelier's Principle.
YZ, a 55 yr old male was up at 5 am. He sufferes from Keratoconjunctivitis sicca and used RESTASIS daily. He had not put in his contacts for the day and grabbed his VOLSOL HC optic drops and put those in accidentially. He was in extreme pain and taken to the ER. The ER flushed his eyes with a saline drip for an hour. He was released and recommended to use COLLYRIUM for fresh eyes for discomfort. YZ read the labels on all of these products and was shocked to see acid as one of the ingredients in the drops recemmended by the ER. He calls the pharmacy to inquire about this. You are the pharmacist and given the call.
1.) What are the primary uses of the 3 products mentioned?
2.) What are the ACTIVE ingredients?
3.) Why did the acid from the VOLSOL HC drops hurt his eyes but not the acid in the COLLYRIUM for fresh eyes?
4.) Explain the purpose of the acid in EACH of the products.
Please answers each question as thouroughly as possible.
Explanation / Answer
1) Restasis is used to hydrate the eyes i.e. to make the eyes wet.
Vosol otic is a drug for ear to clear the wax.
Collyrium is used as an anti-fungal or anti-bacterial drug.
2)Composition of Restasis - Cyclosporin
Composition of Vosol- Acetic acid and hydrocortisone
Composition of Collyrium- Boric acid
3)Restasis is a base which reacts with acid from Vosol to form salt whcih hurts in our eyes. Now ER used saline. This is because saline will reverse the reaction using LeChatelier principle to flush out acid from Vosol from the eyes thus curing it. But collyrium is added to fresh eyes where no Restasis is there so no reaction occurs thus no pain.
4) Acid in Vosol reacts to form salt thus creating pain but acid in collyrium is used to remove the effects of vosol. Thus collyrium acts as a substitute for vosol as both are anti fungal and anti bacterial but collyrium is used for eyes whereas vosol is used for ears.