| Magnesium oxide (MagOx) | 61% elemental magnesium | Two tablets per day with food |
| 242 mg in 400-mg tablet |
| Magnesium hydroxide (Milk of Magnesia) | 42% elemental magnesium | 5 to 15 mL as needed up to four times per day |
| 167 mg in 400 mg per 5 mL oral suspension |
| Magnesium citrate | 16% elemental magnesium | One half to one full bottle (120 to 300 mL) |
| 48 mg elemental magnesium and 13 mg potassium in 290 mg per 5 mL oral solution |
| Magnesium gluconate (Mag-G) | 5% elemental magnesium | One or two divided tablets per day |
| 27 mg in 500-mg tablet |
| Magnesium chloride (Mag-SR) | 12% elemental magnesium | Two tablets once per day |
| 64 mg in 535-mg tablet |
| Magnesium sulfate | 10% elemental magnesium | Atrial fibrillation: IV 1.2 to 5 g initial dose over one to 30 minutes |
| 1 g per 100 mL solution for injection |
| Asthma: IV 25 to 75 mg per kg single dose (study of children younger than 18 years) |
| Eclampsia, preeclampsia: IV 4 to 6 g over15 to 20 minutes, then 1 to 2 g per hour |
| Magnesium sulfate (Epsom salts) | 10% elemental magnesium | Cathartic: mix 2 to 4 teaspoons in 8 oz water; take up to twice per day |
| 98.6 mg in 1 g salts |
| Magnesium lactate (Mag-Tab SR) | 12% elemental magnesium | One to two tablets every 12 hours |
| 84 mg in 84 mg tablet |
| Magnesium aspartate hydrochloride (Maginex DS) | 10% elemental magnesium | Mix in 4 oz water; take up to three times per day |
| 122 mg in 1,230 mg dietary supplement granules |