Wednesday 9 May 2012

Tablet weight variation and uniformity of weight of single dose preparations - Pharmacopeal requirements IP/BP/USP



TABLET WEIGHT VARIATION AND UNIFORMITY OF WEIGHT




Tablet weight is mainly affected by factors such as tooling of the compression machine,head pressure,machine speed and flow properties of the powder.Inconsistent powder or granulate density and particle size distribution are common sources of weight variation during compression.


Variation between tablet with respect to dose and weight must be reduced to a minimum.Uniformity of weight is an in process test parameter which ensures consistency of dosage units during compression.


Test Procedure
Weigh individually 20 units selected at random and calculate the average weight.Not more than two of the individual weights deviates from the average weight by more than the percentage given in the pharmacopea and none deviates by more than twice that percentage.IP/BP & USP limits for tablet weight variation is given below.
                                        

IP/BP
  Limit
USP
80 mg or less
± 10%
130mg or less
More than 80mg or Less than 250mg
± 7.5%
130mg to 324mg
250mg or more
± 5%
More than 324mg





106 comments:

  1. The limits should be like this
    ±10%, ±7.5% and ±5%, because a limit, in general should have lower to upper values.

    ReplyDelete
    Replies
    1. Greetings what is the deference between ±10%, ±7.5% and ±5 and when we use 7.5 % , 10 % and 5 %

      Delete
    2. Greeting what is the deference between we use 7.5%,10% and 5%

      Delete
  2. You are absolutely right..... A limit in general should have lower & upper values.Blog have been updated accordingly. Thanks for your valuable comments...

    ReplyDelete
    Replies
    1. Sir, please if you can clarify that answer in a comment we will be much thankfull because i cannot find that answer in the blog please sir,,

      Delete
  3. What is the difference between weight variation, uniformity of weight, uniformity of dosage unit and range of mean weight?

    Also, is there any circumstances that allow different upper and lower limit?

    Thank you.

    ReplyDelete
  4. “Uniformity of dosage unit” is defined as the degree of uniformity in the amount of the drug substance among dosage units. Uniformity of dosage units can be demonstrated by either of two methods, 1). Content Uniformity ( by assay test) or 2). Weight Variation.

    Refer USP <905> uniformity of dosage units

    ReplyDelete
    Replies
    1. the limits mentioned under USP is for weight variation for dietary supplements. does this apply to all other tablets? as mentioned by u in USP "Uniformity of dosage units can be demonstrated by either of two methods, 1). Content Uniformity ( by assay test) or 2). Weight Variation.". But under weight variation they are calculating content. CLARIFY.

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  5. what are the usefulness of uniformity of weight test in pharmacy

    ReplyDelete
  6. May I know which edition of BP and USP for the table above?

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  7. This comment has been removed by the author.

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  8. Is there any method or any systems should we get just zero percent weight variation tablet? & if we can get this then what are the advantages of that?

    ReplyDelete
  9. How much tablets fall range of limit and that's fall limit ?

    ReplyDelete
  10. what is the importance of uniformity of weight test in pharmacy

    ReplyDelete
    Replies
    1. Because uniform active
      ingriedent is necessary for therapeutic effect.

      Delete
  11. Why are coated tablets exempted from weight variation test?

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  12. The applicable tolerance limit should be applied on the calculated average value or on the nominal weight value of the tablet.

    ReplyDelete
  13. In Many companies they are calculating the limit based on the tablet's nominal weight.

    ReplyDelete
  14. any bdy tell the relationship b/w weight variation nd therapeutic activity of a dosage form

    ReplyDelete
    Replies
    1. When active ingriedent less or more than the following value (range)so may cause toxicity in the body.or no therapeutic effect because ur drug not achieve the therapeutic level.

      Delete
  15. iif you use 10 units will the limits still apply?

    ReplyDelete
  16. when should i follow bp and when should i follow usp ??

    ReplyDelete
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  18. Is this according to USFDA.
    What USFDA says, weight variation should be against average weight or standard weight?

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  19. I would like to know weight variation limit sachet .fill wt 1.5 gr. It is nutrCutical product reg t r k prasad

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  22. What about sachet weight variation limit

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  23. What about sachet weight variation limit

    ReplyDelete
  24. Why only 20 tablets are taken why not more than less than 20 taken?

    ReplyDelete
  25. May I know why 10 or 20 tablets used for group weight?

    ReplyDelete
  26. why we take 20 tablets for average weight ???????????

    ReplyDelete
    Replies
    1. This comment has been removed by the author.

      Delete
  27. What is the weight variation for sugar coated tablet.?

    ReplyDelete
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  29. Can i know formula for weight deviation

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  31. Why only 20 tablets are taken why not more than less than 20 taken?

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  32. Why using 20 tablets of average weight

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  33. What are the factors affecting the uniformity of dosage forms

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  36. May I know what is the advantage of the weight variation of tablet in In-process control?

    ReplyDelete
    Replies
    1. I want to clarify this to you , weight variation during Tablets IPC is highly important in order to achieve patient therapeutic effect .If there is variation in weight then active ingredients per tablet will vary above or below the limit ,this out of limit tablet when taken to human body then therapeutic efficacy can be effected or desired effect can't be achieved

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  39. Please can someone help me with the importance of uniformity of weight test in pharmacy?

    ReplyDelete
    Replies
    1. The target of manufacturing process is to get predetermined specifications, if we consider the mixing process give us a uniform powder, then dosage form weight represent the content of active material in this weight. if weight is less than or greater than nominal then the active material will be deviated by the same difference in each dose and assay variance achieved and the test of uniformity of dosage units may be fail and may lead the process to be not capable due to this variance. Also average weight shall be within limit to achieve predetermined process yield, so you shall do the test of uniformity of weight "mass" to achieve uniformity of dosage units, process capability and process yield within limit.

      Delete
  40. if weight is less than 10 mg than?

    ReplyDelete
  41. Please are the limits mentioned under USP is general for all tablets and capsules or for Dietary supplements only. Please Reply

    ReplyDelete
  42. why are coated tablets exempt from weight variation?

    ReplyDelete
  43. The tablet core is the important part of the dosage form. If its weight and content uniformity are accurate (e.g., within 5%) then the patient`s clinical needs (safety and efficacy) can be assumed to be taken care. On the other hand, film coating is generally for appearance and the coating process is not very uniform. Hence the weight of film coated tablet is collected for information only.

    ReplyDelete
    Replies
    1. I am working as coating supervisor , as I have observed film coating is just for appearance to enhance customer acceptability ,while in sugar coating or enteric coating weight uniformity is important to protect Active ingredients content uniform ly .e.g Neuromet 500mcg contains mecobalmine which is light sensitive .till compression stage it is manufactured under controlled light after compression stage it shipped for sugar coating where it gets sugar coating and thus free to transport in uncontrolled light .

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  44. Why to take 20 tablet for weight variation. U take 10 r 30 whatever its? Pls explain

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  45. My question is related to allowable weight variation for API packaged in 25kg/drum, 50kg/drum , etc. What will be allowable weight variation .

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  49. For any package contents or weights should not be less than specified. There is no lower limit for 25 kg pack.min contents should be 25 kg net.

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  50. does this apply to food supplement in gummie form

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  55. Why take 20 tablets for weight variation. Please reply

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  56. Content uniformity for Oral Powder ( Sachet) as per IP/BP

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  58. What would be the the limits of creams i.e. upper and lower limits during filling like 40g tube weather it would be in house or is there any official limits.

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  59. To which dosage forms does uniformity of weight test apply?

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  60. Why 20 tablets selected for weight variation test

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  62. Who knows what chapter of USP describes 'Weight variation'?

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  63. Why only 20 tablet are use in uniformity and average weight

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  66. How would you know whether batch of tablets investigated meet with required standard(s)

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  67. And also what is the key rationale behind the determination in the uniformity of weight of tablets

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  70. Is the weight calculated based on full dosage form or according to Active ingredient?

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  75. When the weight variation test is not meet the limits. How many times repeat the test and that limits. Please describe.

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  78. why the limit 1 and limit 2 is higher for tablet Weighed below 80 mg where else the limit 1 and 2 is much narrow for tablets above 250 mg ?

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  79. Why we performed average weight on 20 tablets?

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    Replies
    1. As, we know that majority compression machines are designed at 35 to 39 punches.20 tablets are selected for average weight as 20 Punches makes average of compression machines.

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