Lantus

The active substance is insulin glargine. Other ingredients include zinc chloride, metacresol and water for injections. Interactions with other medicines are possible. Some medicines may affect how this insulin works, including beta-blockers, corticosteroids and antidepressants, so speak to your doctor if you use other medicines. Dispose of used needles and pens in line with the instructions from your pharmacy. 

• Common: hypoglycaemia (low blood sugar), skin reactions at the 
  injection site such as redness, swelling or itching 
• Uncommon: allergic reactions, changes in fatty tissue at the 
  injection site 
• Rare: severe allergic reactions (anaphylaxis) 

Most side effects are mild and go away on their own. 

For most people, this medicine is safe. Do not use it if you are allergic to insulin glargine or any of the other ingredients, if you have low blood sugar, or if you are hypersensitive to other types of insulin. Speak to your doctor if you are pregnant, breastfeeding or taking other medicines. Extra caution is needed if you often have hypoglycaemia or if your kidneys or liver do not work as well. Intense exercise may lower your blood sugar further. Hormonal changes, such as menstruation or pregnancy, may affect how insulin works. It may affect your ability to drive or use machines if you develop hypoglycaemia. Store in a fridge at 2–8°C and do not freeze. After first use, it can be kept for up to 4 weeks below 30°C. Protect from light and heat and keep out of the sight and reach of children.