1.0) Description: Visual

2.0) Average Weight: Check weight of 20 tablets at random and calculate the average weight by formula.

Average weight (mg) =   wt of 20 tablets (gm) x 1000


3.0)  Uniformity of weight:

Weigh 20 tablets selected at random and calculate the average weight. Not more than two of the individual weights deviate from the average weight by more than the percentage shown in table.

Weigh the tablets individually and calculate the percentage of deviation for each tablet by using formula:

Deviation (%) =  Weight of each tablet – Average weight    x 100

Average weight


Average weight of tablets Percentage deviation
250mg or More ±5%

4.0 Identification Test:

In the assay, the principal peaks in the chromatogram obtained with the test solution correspond to the peaks in the chromatogram obtained with the reference solution.

5.0)      Hardness:

The standard method used for tablet hardness testing is compression testing. The tablet is placed between two jaws that crush the tablet. The machine measures the force applied to the tablet and detects when it fractures.

6.0)      Disintegration Time:

Unless otherwise stated in the individual monograph, introduce one tablet into each tube and add a disc to each tube. The assembly is suspended in the liquid medium in a suitable vessel, preferably a 1-litre beaker. The volume of liquid is such that the wire mesh at its highest point is at least 15mm below the surface of the liquid, and at its lower point is at least 25mm above the bottom of the beaker. At no time should the top of the basket-rack assembly become submerged. There is a thermostatic arrangement for heating the liquid and maintaining the temperature at 37±2°.

If 1 or 2 tablets fail to disintegrate, repeat the test on 12 additional tablets; not less than 16 of the total of 18 tablets tested disintegrate.

If the tablets adhere to the disc and the preparation under examination fails to comply, repeat the test omitting the disc. The preparation complies with the test if all the tablets in the repeat test disintegrate.

7.0)      Dimension of Tablet:

Diameter and thickness are determined by vernier calliper in mm.

8.0)      Leak test:

The apparatus is used to test for the integrity of packed strips, blisters and Alu-Alu Blister pack containing tablets. Ensure apparatus bath is filled with purified water upto mark indicated and add 0.5% crystal violet solution in water. Samples are placed into the desiccators and the lid is placed in position. The pump starts to produce a vacuum 15inHg inside the desiccators and the vacuum is held for 1 minute. The sample remains at the required vacuum level for given time interval buzzer will sound after time is over and will cut off the vacuum pump. As the package is immersed in a colored dye solution the venting of the desiccators will allow any holes to be penetrated by the dye and the contents of the flexible packaging will also be stained with the same coloring material.

Examine all the strips for any leakage by opening the pockets manually. If anyone pocket shows evidence of leakage, reject the sample, stop the Blister / Strip machine and immediately take corrective action.

9.0)      Assay:

Test solution: Disperse a quantity of the powdered tablets containing 50 mg of Aceclofenac, add 70 ml of the mobile phase, sonicate for 15 minutes, and dilute to 100 ml with the mobile phase and filter. Dilute 2 ml to 25 ml with mobile phase.

Reference solution (a): Weigh 25 mg of reference standard of Thiocolchicoside in 25 ml volumetric add some mobile phase and dissolve the standard. Make upto the mark with mobile phase.

Reference solution (b): Weigh 50 mg of Aceclofenac reference standard in to 100 ml volumetric flask add some mobile phase to dissolve add 2 ml of reference standard (a) into it and make up to the mark with mobile phase. Dilute 2 ml to 25 ml in mobile phase further.

            Chromatographic system:

  • A stainless steel column 150 cm x 4.6 mm, packed with octadecylsilane bonded to porous silica (5µm)
  • Mobile phase: 550 ml of acetonitrile and 450ml of buffer solution. Buffer is prepared by dissolving 780 mg of Na2HPO4 in 500 ml HPLC grade water
  • Flow rate: 0.8 ml per minute
  • Spectrophotometer set at 230 nm,
  • Injection volume: 20 µl

Inject the reference solution (b) and the test solution.

Calculate the content of Aceclofenac and Thiocolchicoside in the tablets.

            Formula: Aceclofenac

Area of Test      STD Wt.(in mg)        2                100                  25          Potency

——————X—————–X——-X——————X——-X————-X Avg.wt.

Area of STD             100                      25      Test Wt.(in mg)      2           100

Formula: Thiocolchicoside

Area of Test       STD Wt.(in mg)     2            2            100              25        Potency

——————–X—————–X——-X———X—————X——-X————-X Avg.wt.

Area of STD                  25                   100      25   Test Wt.(in mg)   2           100

              Acceptance criteria: 90.0%-110.0%


            Perform the test according to requirements of IP,

Total aerobic Microbial count (TAMC): NMT 103 CFU/g

Total combined yeasts/Moulds count (TYMC): NMT 102 CFU/g

Pathogens: in 1gm drug.

           Escherichia Coli – Should be absent

          Pseudomonas aeroginosa – Should be absent

          Salmonella – Should be absent

          Staphylococcus aureus– Should be absent


Wt.:                   Weight

CFU:                 Colony Forming Unit

mg:                    Milligram

NaOH:             Sodium Hydroxide

ml:                     Milliliter

STD:                 Standard

inHg:                 Inch of Mercury

rpm:                  Rotations per minute