important side effects

aluminium, magnesium: long acting if it remains in stomach
magnesium: laxative
aluminium: constipating
contraindicated in hypophosphataemia ???

important interactions

antivirals
eltrombopag (because it's so £££)
Antacids ↓ absorption of several abx including
- doxycycline
- ciprofloxacin

alginates

i.e. gaviscon etc
↓ reflux by ↑ viscosity of stomach contents