Hi welcome to HCM Side effect of Aldactone 0r Spironolactone Drowsiness, dizziness, lightheadedness, stomach upset, diarrhea, nausea, vomiting, or headache may occur. To minimize lightheadedness, get up slowly when rising from a seated or lying position. If any of these effects persist or worsen, notify your doctor or pharmacist promptly. Tell your doctor immediately if any of these unlikely but serious side effects occur: increased thirst, change in the amount of urine, mental/mood changes, unusual fatigue/weakness, muscle spasms, menstrual period changes, breast pain, breast enlargement (gynecomastia) in men, sexual function problems... Nacfil 5gm sachet side effect This fixed dose combination of l-methyl folate (dietary active form of folic acid),vitamin B6 and vitamin B12; is used to treat peripheral neuropathies Anorexia, nausea, vomiting and diarrhoea are the side effects of drug Remember that your doctor has prescribed this medication because he or she has judged that the benefit to you is greater than the risk of side effects. Many people using this medication do not have serious side effects.