Primarily the relationship between medical professionals and
pharmaceutical industry is based on the common goal of providing help to
the people during illness, and to maintain good health. Patients take a
drug prescribed by a doctor because they have full faith in the treating
doctor knowing that a doctor would abide by the cardinal principle of
medical profession. A doctor prescribes a drug believing that any drug
that has been licensed must be safe and approved. Is it a misplaced
trust? [1]. The most important point is that drug formulations should be
appropriate regarding ingredient(s) and the quantity of ingredients.
Unfortunately, many drug formulations do not fulfill criteria to be
labeled as appropriate formulations:
Substandard drugs: In case the quantity of any
ingredient happens to be less than 90% of the quantity mentioned, it is
called substandard drug.
Spurious drugs: In case the ingredient(s)
quantity is zero percent it is called spurious drug.
Irrational formations: Clavulanic Acid is
approved in combination with Amoxicillin, and Sulbactum for combination
with Cefoperozone. Presently many antibiotics in combination with
Clavulanic Acid or Sublactum are available in the market. These
formulations add tremendously to the cost of therapy without providing
any additional benefit to the patients.
Combination of antagonistic ingredients: Iron and
zinc have many similar absorption and transport mechanisms, and may
therefore compete for absorption [2,3]. Iron may interfere with
absorption of Zinc, when ingested together.
Combination of ingredients having different
administration schedules: Many cough and cold formulations have
Cetirizine or Levocetirizine, which are to be administered once in 24
hours. Other ingredients in cold or cough formulations are recommended 3
to 4 times in 24 hours.
Potentially harmful combinations: Paracetamol,
Ibuprofen and Mefenamic acid are marketed as antipyretics. Ibuprofen and
mefenamic acid may have significant side effects [4]. The combination of
these drugs with paracetamol does not offer any advantage, but increases
the chances of adverse effects.
Different quantities of ingredients: Cough syrups
of different brands have different quantity of dextromethorphan per 5 mL
of liquid (e.g. 5 mg, 10 mg and 15 mg). Some doctors may not be
aware of this fact, which can result in inappropriate dosage of
dextromethorphan [4]. There are many formulations meant for providing
relief during cough/cold, which have combinations of different
ingredients in variable quantities.
It seems that in a race for ‘one-upmanship’ the
pharmaceutical industry has turned blind eye to the science of pharmacy
and safety of people. Doctors should have full information about the
drug formulations which they prescribe so as to give right medicine in
right dose.
References
1. Paul Y. Need for safe and doctor friendly drug
formulations. Pharma Times. 2013; 45:31- 2.
2. Sandstrom B. Micronutrient interactions: Effect on
absorption and bioavailability. British J Nutr. 2001;85: 5181-5.
3. Solomons NW, Ruz M. Zinc and iron interaction:
concepts and perspectives in developing world. Nutri Res. 1997;17:177-
85.
4. Grosser T, Smyth E, Fitzgerald GA.
Anti-inflammatory Antipyretic and Analgesic Agents: Pharmacotherapy of
Gout. In: Goodman and Gillman Pharmacological Basis of
Therapeutics, New York: Brunton LL, Chabner BA, Knollman BC. Eds.
12th ed: McGraw Hill; 2011.p.982-7.
5. Paul Y. Dextromethorphan: Problems with formulations. Indian
Pediatr. 2014;51:1019.