Special caution is necessary when Lisonorm is taken together with the following medicines: • diuretics (used to reduce fluid retention) • other medicines used to lower blood pressure (antihypertensives) • non-steroidal anti-inflammatory drugs (NSAIDs) such as acetylsalicylic acid (used to treat for arthritis, muscle pains, headache, inflammation, fever) • lithium, antipsychotics, used to treat mental disorders • insulin and oral antidiabetics • autonomous nervous system stimulants (sympathomimetics), such as ephedrine, phenylephrine, xylometazoline and salbutamol, used to treat congestion, cough, cold and asthma. • immunosuppressants, used to prevent transplant rejection • allupurinol, used to treat gout • narcotics, morphine and related drugs used to treat severe pain • anticancer drugs • antacids, used to treat stomach acidity • anaesthetics, used in surgery or some dental procedures.