Name and Strength of Active Substances
Avadol tablet is a white to off white, round, film-coated tablet with 500
debossed on one side and plain on the other side, diameter around 13mm
Paracetamol is a centrally acting analgesic and antipyretic with minimal
The mechanism of analgesic action has not been fully determined. Paracetamol
may act predominantly by inhibiting prostaglandin synthesis in the central
nervous system (specifically cyclooxygenase (COX)-2) and, to a lesser
extent, through a peripheral action by blocking pain- impulse generation.
The peripheral action may also be due to inhibition of prostaglandin
synthesis or to inhibition of the synthesis or actions of other substances
that sensitize pain receptors to mechanical or chemical stimulation
Paracetamol act centrally on the hypothalamic heat-regulating center to
produce peripheral vasodilatation resulting in increased blood flow through
the skin, sweating and heat loss. Paracetamol reduces fever by inhibiting
the formulation and release of prostaglandins in the CNS and by inhibiting
endogenous pyrogens at the hypothalamic thermoregulator center
Following oral administration paracetamol is rapidly absorbed.
Paracetamol absorption takes place mainly in the small intestine and
therefore the rate of absorption is depending on the rate of gastric
emptying. It has been shown that drugs which delay gastric emptying also
delay the absorption of paracetamol whereas metoclopramide (a drug which
increases the rate of gastric emptying) accelerates absorption of the
analgesic through the total amount absorbed doses not increase.
The presence of food in the stomach has also been reported to reduce the
rate of absorption of paracetamol. Alterations in gastric pH have no
appreciable effect on paracetamol absorption. During absorption, the amount
of paracetamol which is inactivated is negligiable and it has been
shown that paracetamol dose not affect gastric mucosal permeability and does
not produce mucosal bleeding.
Peak plasma concentrations are reached 1 hour after absorption. The
plasma half life is 1 to 3 hours.
Paracetamol penetrates the brain and is present in breast milk of human.
Paracetamol is metabolized by the microsomal enzyme system of the liver.
This metabolism is mainly to the glucuronide and sulphate conjugates,
accounting for approximately 49% and 26% of the ingested dose respectively.
About 4% is excreted as free paracetamol. Other minor pathways include the
production of catechol derivatives and cysteine conjugates (via
glutathione). Paracetamol excretion is rapid and occurs via the urine.
For the relief of fever
For the relief from mild to moderate including: headache, migraine,
backache, musculoskeletal pain, myalgia and neuralgia, dysmenorrhea, pain of
osteoarthritis, toothache, pain after dental procedures/tooth extraction,
pain after vaccination and the discomfort from colds, influenza and sore
1-2 tabs for 3 or 4 times daily. Maximum: 8 tablets /day
Mode of Administration
Hypersensitivity to paracetamol or any of the other ingredients/ components
of the product. Severe and active hepatic impairment.
Warnings and Precautions
preparation contains PARACETAMOL.
Do not take any other paracetamol containing medicines at the same time.
• Keep out of reach of children.
• Do not take if allergic to paracetamol.
• Patients should contact their health care provider if symptoms persist (if
the pain lasts for more than 10 days, if there is redness or fever lasts
more than 3 days).
• Paracetamol should be given
with care to patients with impaired kidney or liver function.
• Large doses should be avoided in patients with hepatic impairment.
Paracetamol overdose may harm the liver.
• Do not exceed recommended dose.
• It should be given with care to patients with alcohol dependence.
• Paracetamol provides symptomatic relief only, additional therapy to treat
the cause of the pain or fever should be instituted when necessary.
Effects on Ability to Drive and Use Machines
It is unlikely to impair a patient's ability to drive or use machinery.
Interactions with Other Medicaments
The anticoagulant effect of warfarin and other coumarins may be enhanced by
prolonged regular daily use of paracetamol with increased risk of bleeding;
occasional doses have no significant effect.
Statement on Usage During Pregnancy and Lactation
Use in pregnancy:
• Considered to be the analgesic of choice in pregnant patients.
• Although it crosses placenta, paracetamol is considered to be safe in
normal therapeutic doses for short-term use as a minor analgesic/antipyretic
Use in lactation:
• Excreted in breast milk.
• Maternal ingestion of paracetamol in normal therapeutic doses does not
appear to present a risk to the nursing infant.
Adverse Effects / Undesirable Effects
Adverse effects of paracetamol are rare and usually mild, although
haematological reactions have been reported. Skin rashes and other
hypersensitivity reactions occur occasionally.
Overdose and Treatment
Toxic symptoms include vomiting, abdominal pain, hypotension and sweating.
The most serious adverse effect of acute overdose of paracetamol is a
dose-dependent, potentially fatal hepatic necrosis. Clinical and laboratory
evidence of hepatoxicity may be delayed for up to one week. Major
manifestations of liver failure such as jaundice, hypoglycemia and metabolic
acidosis may take at least 3 days to develop.
In cases of overdose, methods of reducing the absorption of ingested drug
are important. Gastric lavage is essential even if several hours have
elapsed. Prompt administration of 50g activated charcoal and 500ml iced
mannitol 20% by mouth, may reduce absorption. If the history suggests that
15g Paracetamol or more has been ingested, administer one of the following
Acetylcysteine 20% i.v.: Administer intravenously, 20%
acetlcysteine immediately without waiting for positive urine test or plasma
level results: initial dose of 150mg/kg over 15 minutes, followed by
continuous infusion of 50mg/kg in 500ml 5% glucose/dextrose over 4 hours and
100mg/kg in 1L 5% glucose/dextrose over 16 hours;
Oral Methionine: 2.5g immediately followed by three further doses of
2.5g at four hourly intervals. For a 3 year old child, 1g methionine every
four hours for four doses has been used;
Oral Acetvlcysteine 5%: 140mg/kg as a loading dose, then 70mg/kg
every 4 hours for a total of 17 maintenance doses. If more than ten hours
have elapsed since the overdosage was taken, the antidote may be in
Store below 30°C.
Dosage Forms and Packaging Available
Strip pack of 10's per strip. Box of 20x10's, 2x10's, 1 x10's.
Three years from manufactured date.