Home About us Editorial board Ahead of print Current issue Search Archives Submit article Instructions Subscribe Contacts Login 
  • Users Online: 11206
  • Home
  • Print this page
  • Email this page

   Table of Contents      
ARTICLES
Year : 1982  |  Volume : 30  |  Issue : 4  |  Page : 257-260

Adverse drug reactions


Ex. Professor and Head-Ophthalmic Deptt. Seth G S. Medical College and K.E M. Hospital Mumbai, India

Correspondence Address:
G Mody
Ex. Professor and Head-Ophthalmic Deptt. Seth G S. Medical College and K.E M. Hospital Mumbai
India
Login to access the Email id

Source of Support: None, Conflict of Interest: None


PMID: 7166400

Rights and PermissionsRights and Permissions

How to cite this article:
Mody G. Adverse drug reactions. Indian J Ophthalmol 1982;30:257-60

How to cite this URL:
Mody G. Adverse drug reactions. Indian J Ophthalmol [serial online] 1982 [cited 2020 Feb 27];30:257-60. Available from: http://www.ijo.in/text.asp?1982/30/4/257/29443

Pollution of food, water, air, noise and the pollution of the correct way of life, all go to reduce life to a drudgery. They so insidiously creep into our existence making us vulnerable to all kinds of adverse effects; drugs are no exception.

The adverse reactions to drugs are as old as medicine itself; though such discussions have become topical in the last few decades, owing to our ever increasing understanding of the structure and properties of the agents used.

Modern drugs can be likened to nuclear power. If well channelised, they can move mountains, but if misused, they stop nowhere, short of total annihilation.

In the rat race for reputation and unbrid­led ambition, potent drugs are often used to produce apparently dramatic results, where simple medicines would have worked as well, though less dramatically. Here the therapeutics is misused for a transient triumph.

With this brief introduction let us move on to discuss adverse effects on the eye and its adnexa by drugs administered systemically.

Adverse drug reactions are rationally and clinically classified into two groups

Group A : Quantitatively abnormal reac­tions.

These reactions are the result of an exagge­rated but otherwise usual pharmacological action of the drug. These reactions are often related to the dosage and can often be expec­ted. These adverse effects can be managed by adjustments of the dose or by changing over to a similar drug but less likely to cause adverse effects and by using additional drugs which counter act the side effects of the original drug.

Group B : Qualitatively abnormal actions.

These reactions are totally abnormal. They have no relation to the drug's normal pharmacology.

They are unexpected and unforeseen. These qualitative adverse reactions are due to four causes :

Genetic : Like erythrocyte glucose-6 phosphate dehydrogenase-G-S-PD enzyme deficiency causing genetically based disorders.

(2) Immunological or allergic-mediated by immunological mechanism-Stevens­Johnson syndrome.

(3) Teratological-caused by drugs given to mother during pregnancy causing adverse effect on foetus and neonate-like Thalido­mide, so-called safe hypnotic was given during pregnancy causing phacomalia or micromalia, anophtbalrnos microphthalmos, colobomata.

(4) Neoplastic or carcinogenic disorders­caused by large number of drugs given unnecessarily and also by drugs given necessa­rily but for a long period of time-about 10 years,

Eye disorders caused by drugs administered systemically are fairly common-about 4% according to a U.K. report. Some salient adverse drug reactions on the different tissues of the eye and its adnexa are :

Eye-lid and orbit

(1) Oedema, (2) Discolouration, (3) disorders of lid position.

Oedema of lid and orbit

i) Iodides are known to cause oedema of lids.

ii) Primidone (Mysoline) -an antiepileptic agent often causes oedema of lids, orbit and periorbital tissues.

iii) Excessive doses of vitamin A (so frequently given in massive dosage) can cause periorbital oedema with loss of eye brows and eye lashes.

iv) Marked reactionary oedema and incre­ase in exophthalmos is caused by ill-regulated dosage of antithyroid drugs (Thiourea deriva­tives--methyl-thioracil and Lugoi's solution and radio-iodine).

(2) Discolouration of eye lids

Diffuse pigmentation (melanin) of eye lids as a separate reaction or as a part of oculo-cutaneous syndrome i.e. pigmentation of the skin exposed to sunlight and lenticular opacities by long usage of chlorpromazine (Largactil), a major tranquiliser and powerful antiemetic agent-not to be misused or used for minor disorder.

(3) Disorders of lid position

Ptosis

i) Adrenergic neurone blocking agents­

Guanethidine (Ismelin).

ii) Ganglion blocking agents-Inversine

iii) Anti-epileptic agent - Dilantin

sodium

iv) Anti-amoebic and anti-malari (Chloroquin).

Chloroquin, besides ptosis, may cau whitening of eye lashes.

Lid retraction

Sympathomimetic drugs, adrenaline etc.

(4) Disorders of Lacrimal apparatus

Decreased tear secretion

i) Anticholingric drugs-Atropine

ii) Ganglion blocking agent-Inversine

iii) Selective beta adrenoceptor blocking agent-Practolol (Eraldin)

It may even cause keratoconjunctivitis sicca

Conjunctiva

The most important adverse reaction is a serious type of exudative conjuctivitis with necrosis and subsequent fibrosis of conjunctiva

Stevenson-Johnson Syndrome

Drugs responsible are (1) sulphonamide, (2) chlorpropamide (oral anti-diabetic agent­Diabenes). (3) Adrenergic blocking agent­practolol. F

Cornea

a) Subepithelial corneal opacities can result from­

1) Antimalarial drugs-chloroquine and mepacrine.

2) Major tranquiliser and antiemetic chlorpromazine (Largactil).

b) Band shaped keratopathy-excessive dosage of vitamin D.

c) Herpes Simplex ulceration is enhanced even by systemic use of corticosteroids.

Miosis or constriction of pupil is caused by parasympathomimetic like carbachol and neostigmine and morphine. Miosis caused by morphine is useful in acute glaucoma.

Mydriasis

Mydriasis or dilatation caused by Belladonna, atropine, antihistaminics like Phenergan; Avil and Benadryl and antidiabetic oral chlorpropamide (Diabenes), and appetite suppressant drug felfuramice.

Refractive Changes

Refractive changes manifest themselves by blurring of vision.

Transient hypermetropia : Drugs causing cycloplegia and mydriasis result in hyperme­tropia. Some of these drugs are anticholiner­gic drugs, anti-histamines and ganglion blocking agents.

Transient myopia : Oral diuretics like Lasix, steroids like ACTH and antibiotics like tetracyclines.

Lens

Chlorpromazine (Largactil) may cause lens opacities-as an entity by itself or as a part of oculo-cutaneous syndrome.

Prolonged use of corticosteroids causing lens opacities is now fully accepted.

Retina

1) Pigmentary dystrophy with attenuation of blood vessels is caused by­

a) Anti-malarial-chloroquin in large doses

b) Phenathiazine (Malleril)

c) Indomethacin Loss of vision due to marked vasoconstric­tion and death of retinal cells-Quinine.

3) Digoxin (Cardiac glycoside) causes 'Digoxin Ratinopathy'.

Optic Nerve

a) Papilloedema : Papilloedema may be caused by drug inducing raised intracranial pressure pseudouiotor cerebri)

i) Corticosteroid - Prednisolone, Triamcilone cause adrenocortical insufficiency.

ii) Excessive dosage of vitamin A.

b) Optic neuropathy and optic atrophy

i) Enterovioform (Clioquinol)

ii) Chloramphenicol

iii) Anti-tuberculous drugs - Isoniazide, PAS, Ethambutol and Streptomycin

Ocular movement and Diplopia

i) Indomethacin

ii) Chlorpropamide (oral anti-diabetic­ Diabenes)

iii) Diazepam

Psychic

Visual images

i) Unformed visual images like flashes of light by drugs used for CNS disorders.

(ii) Formed images or hallucination - Salicylates

- Chlorpropamide (anti-diabetic agent)

- Frusemide (Lasix)

- L.S.D.

Oral Contraceptives

Though they are reported to cause mydria­sis and cycloplegia, perivasculitis and papilloe­dema but in my observation they have no significant adverse effects. Million of women are using oral contraceptives daily for months and years together but if a few ill effects are noticed, I would not consider this as adverse drug reaction. All I can say is that they are safe for the eye, safer for the user and safest for the co-participant, and for their honour. In short it is satisfaction all through.


  Conclusion Top


At the fag-end of this talk, most of you will have been depressed by the hoard of adverse reactions enlisted.

To lift the gloom, and in all fairness to give drugs their due, and with just these words­

Drugs are formidable agents. If prescribed and used with caution and care, wisdom and propriety, their benefits far exceed their advers reactions.




 

Top
 
 
  Search
 
    Similar in PUBMED
   Search Pubmed for
   Search in Google Scholar for
    Access Statistics
    Email Alert *
    Add to My List *
* Registration required (free)  

 
  In this article
Conclusion

 Article Access Statistics
    Viewed3530    
    Printed77    
    Emailed2    
    PDF Downloaded0    
    Comments [Add]    

Recommend this journal