Mepresor Tablets Usage And SafetyDosageMetoprolol TartrateSide EffectsCommon (may affect up to 1 in 10 people): tiredness, dizziness, headache, a slow heart rate, feeling faint on standing due to low blood pressure, shortness of breath with or without strenuous physical activity, feeling or being sick, stomach pain. Rare (may affect up to 1 in 1,000 people): depression, nightmares, inability to think clearly, sleepiness or difficulty in sleeping, tingling or ?pins and needles?, difficulty breathing, heart failure, irregular heart rate, palpitation, water retention causing swelling, Raynaud?s phenomenon (causing pain, numbness, coldness and blueness of the fingers), diarrhoea or constipation, skin rash, muscle cramps. Very rare (may affect up to 1 in 10,000 people): changes in the results of blood tests, effects on blood clotting causing easy or unexplained bruising, changes in personality, hallucinations, visual disturbances, dry or irritated eyes,ringing in the ears, loss of hearing with high doses, heart conduction problems, chest pain, gangrene in patients with severe poor circulation,runny nose, dry mouth, weight gain sensitivity to light, increased sweating, hair loss, worsening or new psoriasis, joint inflammation (arthritis), disturbances of sexual desire and performance, changes in liver function tests.Drug InteractionsMonoamine oxidase inhibitors (MAOIs) , verapamil, nifedipine and diltiazem , disopyramide or quinidine , cimetidine , hydralazine, clonidine or prazosin , amiodarone and propafenone , tricyclic or SSRI antidepressants , barbiturates , phenothiazines , anaesthetics such as cyclopropane or trichloroethylene , aldesleukin , alprostadil , anxiolytics or hypnotics , indometacin or celecoxib , rifampicin (antibiotic) or terbinafine , lidocaine , moxisylyte , tropisetron , diphenydramine.IndicationIt is used to treat : ? High blood pressure ? Angina pectoris (pain in the chest caused by blockages in the arteries to the heart) ? Irregular heart rhythm (arrhythmia) ? The symptoms caused by an overactive thyroid gland (thyrotoxicosis ) .When not to UseDo not take Metoprolol if you: ? Are allergic to metoprolol, other beta-blockers or any of the other ingredients of this medicine .? Suffer with heart conduction or rhythm problems? Have severe or uncontrolled heart failure ? Are in shock caused by heart problems? Suffer with blocked blood vessels, including blood circulation problems (which may cause your fingers and toes to tingle or turn pale or blue)