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Metipranolol-Induced Adverse Reactions: I. the Rechallenge Study

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Metipranolol-Induced Adverse Reactions: I. the Rechallenge Study METIPRANOLOL-INDUCED ADVERSE REACTIONS: I. THE RECHALLENGE STUDY TAYO AKINGBEHIN*, JOSE R. VILLADA*, TOM WALLE Yt Southport and Liverpool SUMMARY beta-blocker licensed in the United Kingdom for the treat­ Previously unreported adverse drug reactions can be dif­ ment of glaucoma in 1986, although it was in widespread ficult to detect and it may be even more difficult to estab­ use in Europe for many years before that and was recently lish a cause and effect relationship, particularly if the marketed in the United States (1991). Some authors sug­ adverse reacions mimic naturally occurring disease. In a gested that metipranolol was less well tolerated than other previous paper we reported 29 patients with granuloma­ beta-blockers with a high incidence of subjective but not tous anterior uveitis, blepharoconjunctivitis, periorbital objective side effects.2•3 In February 1990, we saw 5 cases dermatitis, marginal keratitis and elevation in intra­ of either granulomatous anterior uveitis or blepharocon­ ocular pressure (lOP), suspected to be caused by meti­ junctivitis or both in patients using metipranolol. These pranolol (Glauline). With the approval of the District associations were reported by "yellow card" to the Com­ Ethics Committee 7 of those patients were rechallenged mittee on Safety of Medicines (CSM) who had one pre­ with metipranolol 0.3% compared to timolol maleate vious report of iritis with this drug and to the 0.5% in a double blind trial. The 7 metipranolol treated Pharmaceutical Company who had no previous reports eyes developed an adverse reaction within 14 days. Meti­ either from Germany or the United Kingdom where more pranolol (Glauline) has been conclusively proven to cause than 700,000 prescriptions had been issued up to 1990 granulomatous anterior uveitis, blepharoconjunctivitis (Smith & Nephew, personal communication). and elevation in lOP, adverse effects never previously We suspected that metipranolol was responsible for reported with any of the ophthalmic topical beta-block­ these inflammatory reactions and undertook a review of all ers. The multidose preparations of metipranolol (Glau­ of our patients on this drug. The details have been pub­ line) in all three strengths 0.1 %,0.3% and 0.6% and the lished elsewhere.4 Since this association has not been pre­ single dose minim preparation of metipranolol 0.6 % have viously described, we felt that it was important to establish now been withdrawn from clinical use in the United Kingdom. a cause and effect relationship. We therefore identified further patients who had developed ocular inflammation Topical beta-blockers have become very popular in the whilst receiving metipranolol and with their consent treatment of glaucoma since the first, timolol, was intro­ rechallenged with this drug. duced in 1978. All topical beta-blockers were thought to have a similar side effect profile, with rare serious RECHALLENGE STUDY systemic effects such as bronchospasm, and few ocular The protocol for this study was submitted to the District adverse effects. These ocular effects could be divided into Ethics Committee and approval obtained. the subjective (burning and stinging on instillation, eye After full explanation patients gave written consent for pain, foreign body sensation) and the objective (external the following study: double blind comparison between eye inflammation, punctate keratopathy, dry eye syn­ metipranolol 0.3% and timolol 0.5%. It was felt to be drome and corneal anaesthesia). 1 Intraocular inflam­ unethical to use placebo in glaucoma patients and there­ mation had not previously been described as an adverse fore timolol was used as the comparable drug. All patients effect of these drugs. had pre-trial lOPs controlled by other ophthalmic topical Metipranolol (Glauline, Smith and Nephew) is a topical beta-blockers. From: *The Department of Ophthalmology, Southport and Fonnby Patients were given two identical bottles, labelled right District General Hospital; tThe Department of Phannacology, eye and left eye, one containing metipranolol 0.3% and the University of Liverpool. other timolol maleate 0.5% eye drops in a randomised Correspondence to: Mr Tayo Akingbehin MD, FRCS, FCOphth, Department of Ophthalmology, Southport and Fonnby District General fashion. Patients were told to apply two drops from the Hospital, Southport. appropriate bottle twice a day. Patients were given enough Eye (1992) 6, 277-279 278 T. AKINGBEHIN ET AL. Table I. Reasons for failure to complete the study which received timolol showed any adverse reactions during the period of the study, 5 of these eyes had pre-trial Reason No of patients metipranolol-induced adverse events. Unexplained non-attendance 3 The 2 eyes with blepharoconjunctivitis and 2 of the 3 2 Illness eyes with granulomatous anterior uveitis were treated Holiday 1 immediately with topical steroids and they all showed complete resolution of symptoms and signs within two drug for two weeks, at which time they returned to the weeks. The third eye with granulomatous anterior uveitis, clinic for review. 1 eye with periorbital dermatitis and 1 eye with loss of Patients were to be reviewed every two weeks but had intraocular pressure control did not receive any active access to the investigators at all times. The study was treatment following the termination of the trial drug. intended to last a maximum of six months but was to be These 3 eyes also showed complete resolution of symp­ terminated at any time if the patient wished or if signs of toms and signs within two weeks. All the 7 eyes with meti­ ocular inflammation or elevation in lOP developed. pranolol associated adverse reactions were later treated Before entering the study all the patients underwent: with another anti-glaucoma medication (timolol in 6 eyes (1) full medical history and ocular examination including and levobunolol in 1 eye) and have shown no adverse reac­ the measurement of visual acuity, lOP and grading of the tion to the alternative topical beta-blocker to date. following parameters (using scores from 0-3), watering, blurring, photophobia, conjunctival injection, corneal DISCUSSION oedema, keratic precipitates (KPs), aqueous flare,aqueous Definitive proof of cause and effect relationship in adverse cells, anterior vitreous cells, hypopion and posterior drug reactions can be difficult to obtain. Naranjo et ae synechia. laid down certain criteria which ideally should be fulfilled (2) chest X-ray. to prove causality, although this is not always possible. (3) full blood count, erythrocyte sedimentation rate, urea These criteria are- and electrolytes, VORL, toxoplasma and toxocara serol­ (1) The event should be described frequently and hence be ogy, serum angiotensin converting enzyme and fasting well documented. blood sugar. (2) The event should improve on withdrawal of the drug. (3) Other possible causes for the adverse event should be RESULTS excluded. Thirteen patients agreed to participate in the rechallenge (4) The event should be more severe with increased dose but only 7 (2 males, 5 females, mean age 71.5 years) com­ of the drug. pleted the study. The reasons for the withdrawal of 6 (5) There should be objective evidence of the adverse patients are given in Table I. event. The previous adverse effects suffered by the 7 patients (6) The patients should suffer a similar effect with similar were bilateral granulomatous anterior uveitis in 4 patients; drugs. unilateral granulomatous anterior uveitis in 2 patients and (7) The event should recur on challenge with the suspected periorbital dermatitis in 1 patient. Of the 2 patients with drug. unilateral granulomatous anterior uveitis, 1 was receiving The most powerful of these criteria is whether the metipranolol in both eyes and the other in the affected eye adverse effect recurs on challenge with the suspected only. drug. The results of this rechallenge study provides Screening of these patients showed that 1 had positive unequivocal evidence that metipranolol causes periorbital toxoplasma serology, and another had non-insulin dermatitis, blepharoconjunctivitis, granulomatous anterior dependent diabetes mellitus. In neither case was it thought Table II. Distribution of ADRs in patients pre and post rechallenge. that these contributed to the inflammationor the elevation Time of patients withdrawal in lOP. pre-trial ADRs rechallenge ADRs Time All of the patients developed an objective documented Patient Reaction Eyes involved Metipranolol Timolol (days) adverse reaction in the eye which was treated with meti­ I 5 pranolol 0.3% within 2-14 days and the trial was termi­ GAU LE GAU (LE) N.A. 2 GAU RE+LE Be (LE) nil (RE) 2 nated in each case. Three eyes of 3 patients had 3 GAU RE+LE GAU +Be + nil (RE) 14 granulomatous anterior uveitis, 2 eyes of 2 patients had ectropion+ blepharoconjunctivitis, 1 eye of 1 patient had periorbital lOP (LE) 4 GAU RE lOP (RE) nil (LE) 14 dermatitis, and 1 eye of the seventh patient which was 5 GAU RE+LE GAU (RE) nil (LE) 7 white and quiet on examination had a rise in lOP from 25 6 POD RE+LE POD (LE) nil (RE) 14 7 Be 14 mmHg pre-trial to 42 mmHg (Table 11). One of the patients GAU RE+LE (LE) nil (RE) (No 3) who developed metipranolol-induced granuloma­ GAU granulomatous anterior uveitis tous anterior uveitis had co-existing blepharoconjunctiv­ Be blepharoconjunctivitis POD periorbital dermatitis itis with secondary ectropion due to the skin changes and lOP intraocular pressure loss of lOP control (610P 22 mmHg). None of the eyes N.A. not applicable EVIDENCE FOR NEW DRUG-INDUCED
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