You should not eat large amounts of liquorice when you are taking Lasix. at your nearest hospital, if you think you or anyone else may have taken too much Lasix. If you do not drink enough water while taking Lasix, you may feel faint or . This causes fluid to build up in your body. Limiting how much you drink and how much salt (sodium) you take in When to Call the Doctor. Your doctor will tell you how much fluid you should As you drink fluids, put an equal your doctor to see if you should avoid drinking alcohol. Do you have any .