# Pharmacy Rx

Alligation Medial Alligation Medial is quite calculated differently than your usual alternate Alligation (tic tac toe) Method! I decided to review the Alligation Medial Method because many techs tend to get confuse by it because of the name similarity.

Define: The Alligation Medial is used to calculate to figure out the total % strength when two or more liquid solutions are mixed.

Define: The Alligation (tic tac toe) Method is used to calculate when two solution strengths (%) is mixed into the desired strength (prescribed by dr.) to get a specific amount of milliliter for each two solution strengths (%) as explained above to equal our final liquid (ml) volume that was prescribed as given. Ex 1) What is the percentage of alcohol in the following mixture?

Alcohol 2%      5 ml

Alcohol 4%     10 ml

Step 1: Add the quantity of all milliliter components

5 ml + 10 ml = 15 ml

Step 2: Multiply the quantity of each milliliter component used in the mixture by it's corresponding % strength, and then add up the products

* 5 ml x 2% = 10

* 10 ml x 4% = 40

* 10 + 40 = 50

Step 3: Divide the final value from step 2 by the final value in step 1

50 / 15 ml = 3.33%  answer What is the percentage of alcohol in the following mixture?

Tincture A- 110 ml              35% alcohol

Tincture B- 220 ml             25% alcohol

Tincture C- 330 ml             20% alcohol