Tenif

Side effects

Medicines and their possible side effects can affect individual people in different ways. The following are some of the side effects that are known to be associated with this medicine. Because a side effect is stated here, it does not mean that all people using this medicine will experience that or any side effect.

Rash

Disturbed sleep

Fatigue

Blood disorders

Disturbances of the gut such as diarrhoea, constipation, nausea, vomiting or abdominal pain

Dizziness

Flushing

Excessive fluid retention in the body tissues, resulting in swelling (oedema)

Slow heart rate (bradycardia)

Breathing difficulties due to a narrowing of the airways (bronchospasm)

Temporary worsening of chest pain (angina) at the start of therapy

Decrease in sperm function

Headache

The side effects listed above may not include all of the side effects reported by the drug's manufacturer. For more information about any other possible risks associated with this medicine, please read the information provided with the medicine or consult your doctor or pharmacist.

How can this medicine affect other medicines?

In individuals with diabetes, atenolol can prolong the lowering of blood sugar (hypoglycaemia) caused by insulin or other antidiabetic medicines. Individuals should monitor their blood sugar, as atenolol can also mask the signs of hypoglycaemia. When atenolol is taken together with calcium channel blockers such as verapamil or diltiazem, the risk of slow heart rate, hypotension and heart failure may be increased. Verapamil and diltiazem should not be taken with this medicine. When taken together with additional calcium channel blockers, there may be an increased risk of low blood pressure and heart failure. If atenolol is taken together with clonidine, there is a risk of a rebound increase in blood pressure if clonidine is stopped. The atenolol should be stopped several days before slowly stopping the clonidine. Non-steroidal anti-inflammatory drugs (NSAIDs) such as indomethacin may reduce the blood pressure lowering effects of atenolol. The use of certain anaesthetics with atenolol may increase the risk of low blood pressure and slow heart rate. There is an increased risk of extremely slow heart rate when digoxin is taken with this medicine. In addition nifedipine may increase the blood level of digoxin, which may lead to an increase in the adverse effects of digoxin. Anti-arrhythmic medicines such as amiodarone or dipyridamole may increase the risk of slow heart rate when taken with this medicine. Rifampicin should not be taken with this medicine as it can decrease the blood level of nifedipine, making it less effective. Cimetidine may increase the blood level and effect of nifedipine. When nifedipine is taken together with quinidine there may be an alteration in the blood level of either medicine. Atenolol may decrease the effectiveness of medicines such as adrenaline when used to treat severe allergic reactions (anaphylaxis).

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