it is also known that the appropriate , effective preoperative , perioperative and postoperative analgesia are necessary to control the pain . inadequately controlled pain results in an unwillingness or refusal to eat and drink ; this can hinder recovery and early discharge . poor pain management after discharge continues to impair the patient &# 39 ; s ability to eat and drink adequately with the accompanying risk of dehydration , infection and secondary hemorrhage . use of nsaids in controlling the pain is well known in the art . the use of non - steroidal anti - inflammatory drugs ( nsaids ) like ibuprofen is associated with number of side effects . the most common side effects from ibuprofen are rash , ringing in the ears , headaches , dizziness , drowsiness , abdominal pain , nausea , diarrhea , constipation and heartburn . it has been reported that the nsaids reduce the ability of blood to clot and therefore increase bleeding after an injury . ibuprofen may cause ulceration of the stomach or intestine , and the ulcers may bleed . it is also reported that the nsaids reduce the flow of blood to the kidneys and impair function of the kidneys and individuals with asthma are more likely to experience allergic reactions to ibuprofen and other nsaids . fluid retention ( edema ), blood clots , heart attacks , hypertension and heart failure have also been associated with the use of nsaids . the present inventors while working on the paracetamol and ibuprofen suspension formulation have noticed that when a lower dose range of ibuprofen i . e . between 40 - 80 mg / 5 ml is combined with 100 - 500 mg / 5 ml of paracetamol , it provides better management of preoperative , perioperative as well as postoperative pain and reduced side effects of ibuprofen ( nsaids ) as compared to the use of ibuprofen ( 100 mg / 5 ml or more ) alone . the present inventors have also noticed that the oral suspension formulation comprising 100 - 200 mg / 5 ml of ibuprofen and 200 - 450 mg / 5 ml of paracetamol can be used in the treatment and management of preoperative , perioperative as well as postoperative pain associated with surgeries . the present inventors have further noticed that the suspension formulation of the present invention provides significantly better pain management following surgery , relieves discomfort that may be due to oedema , inflammation or muscle spasm , early recovery and discharge , overcome the problem of managing these two drugs separately and to improve the quality of analgesia in perioperative , postoperative and other settings . the pharmaceutical oral suspension composition of the present invention comprises paracetamol and ibuprofen as active ingredients . the composition of the present invention can be prepared by adding paracetamol , ibuprofen and pharmaceutically acceptable excipients to purified water followed by mixing . the ph of the obtained suspension can be adjusted in the range of 2 - 6 by using suitable pharmaceutically acceptable excipients followed by adding a suitable flavoring agent . the pharmaceutically acceptable excipients may include one or more of suspending or viscosity increasing agents , sweeteners , buffering agent , preservatives , wetting agents , flavoring agent , solvents and the like . suitable suspending or viscosity increasing agents may include one or more of xanthan gum , guar gum , tragacanth , acacia , gelatin , carrageenan , agar - agar , povidone , alginic acid , sodium alginate , propylene glycol alginate , carbomer , magnesium aluminium silicate , carboxymethylcellulose calcium , sodium carboxymethylcellulose , ethylcellulose , methylcellulose , hydroxypropyl methylcellulose , hydroxyethylcellulose , hydroxypropylcellulose , microcrystalline cellulose , polydextrose , sucrose , sorbitol , xylitol , dextrose , fructose , maltitol , bentonite , polyvinyl alcohol , colloidal silicon dioxide , and the like . suitable sweeteners may include one or more of sucrose , sorbitol , xylitol , dextrose , fructose , maltitol , acesulfame potassium , aspartame , saccharin , saccharin sodium , liquid maltitol , liquid glucose , cyclamate , sodium cyclamate and the like . suitable buffering agents may include one or more of citric acid , sodium citrate , sodium phosphate , potassium citrate , and the like . suitable preservatives may include one or more of sodium benzoate , benzoic acid , ethylenediaminetetraacetic acid , sorbic acid , bronopol , butyl paraben , methyl paraben , ethylparaben , propyl paraben , sodium propionate , chlorhexidine , potassium sorbate , propylene glycol , sodium bisulfite , sodium metabisulfite , sodium salts of hydroxybenzoate and the like . suitable wetting agents may include one or more of polyethylene glycol , polysorbates , sorbitan esters and the like . suitable flavoring agents may include one or more of artificial strawberry flavor , artificial cream flavor , vanilla , cherry , raspberry and the like . suitable solvents may include one or more of water , glycerol , propylene glycol , polyethylene glycol , ethanol and the like . the present invention is further illustrated by the following examples which are provided merely to be exemplary of the invention and do not limit the scope of the invention . certain modifications and equivalents will be apparent to those skilled in the art and are intended to be included within the scope of the present invention . procedure : the composition disclosed in examples 1 and 2 were prepared by adding to purified water , paracetamol , ibuprofen , magnesium aluminum silicate , xanthan gum , liquid maltitol , sodium benzoate , saccharin sodium , polysorbate 80 , and sorbitan oleate , followed by mixing to get a suspension . the ph of the obtained suspension was adjusted between 2 - 6 by citric acid and suitable flavor was added to it . procedure : the composition disclosed in examples 3 and 4 were prepared by adding to purified water , paracetamol , ibuprofen , magnesium aluminum silicate , xanthan gum , liquid maltitol , sodium benzoate , saccharin sodium , polysorbate 80 , and sorbitan oleate , followed by mixing to get a suspension . the ph of the obtained suspension was adjusted between 2 - 6 by citric acid and suitable flavor was added to it . procedure : the composition disclosed in examples 5 and 6 were prepared by adding to purified water , paracetamol , ibuprofen , magnesium aluminum silicate , xanthan gum , liquid maltitol , sodium benzoate , saccharin sodium , polysorbate 80 , and sorbitan oleate , followed by mixing to get a suspension . the ph of the obtained suspension was adjusted between 2 - 6 by citric acid and suitable flavor was added to it . while the present invention has been described in terms of its specific embodiments , certain modifications and equivalents will be apparent to those skilled in the art and are intended to be included within the scope of the present invention .
the present invention relates to an oral pharmaceutical suspension comprising paracetamol and ibuprofen . the invention also relates to a method of treating perioperative or postoperative pain by administering to a subject a therapeutically effective amount of oral pharmaceutical suspension comprising paracetamol and ibuprofen .