# pharm calc

 changing the strength of a pharmaceutical preparation concentration add active ingredientadmixture with a like preparation of greater strengthevaporation of vehicle (if liquid) changing the strength dilution add diluentadmixture with a like preparation of lesser strength provide a product strength more suitable for use by a particular patient elderly or young same amount active ingredient -diluent=increase concentration+diluent=decrease concentration Strengteh and total quantity if the amount of active ingredient remains constant, any change in the quality of a solution or mixture of solids is inversely proportional to the percentage or ration strength increase quantity percentage or ration strength decreases decrease quantity percentage or ratio strength increases Relationship between total quantity and strength C1Q1=C2Q2 Stock solutions concentrated solutions of active or inactive sibstances (increase concentrated)used as a convenience to prepare solutions of lesser concentrations "should be added to" need to subtract amount already present from amount found in Q1C1=Q2C2 equation Alligation arithmetical method of solving problems that involves the mixing of slutions or mixtures of solids possessing different percentage strengths Alligation Medial percentage strength of each component is multiplied by its corresponding quantitysum of the products is divided by the total quantity of the mixtureresultant decimal fraction is multiplied by 100 to give percentage strength of mixture Alligation Alternate calculate the number of parts of 2 or more components of a given strength when they are mixed to prepare a mixture of desired strength Alligation Alternate strength of a mixture (desire) must lie somewhere between the strengths of its componentsstronger than its weakest componentweaker than its strongest component reducing and enlarging formulas reduce or enlarge formulas for pharmaceutical preparationsoffical formulas are based on the preparation of 1000 mL or 1000g Smaller quantity reduce formula greater quantity enlarge formulamaintain the correct proportion of one ingredient to another Step 1 Determine the factor that defines the multiple (enlarge) or the decimal fraction(refuce) of the amount of formula to be prepared Factor=want/have quantity of formula desired/quantity of formula given Step 2 Multiply the quantity of each ingredient in the formula by the factor to determine the amount of each ingredient required in the reduced or enlarged formula Formulas that specify proportional parts indicate the relative proportion of each of the ingredients in the formula either by eright or volume Authormarinir ID51042 Card Setpharm calc Descriptionaltering product strengths Updated2010-11-22T04:56:29Z Show Answers