Which of the following are the advantages of Dry powdered Inhalers (DPIs) over Metered Dose inhalers (MDIs) ?
1. It requires less manual dexterity
2. It does not require spacer
3. It is effective in patients with low FEV1 (<1L)
4. There is no need to coordinate device puffs with inhalation
Select the correct answer using the code given below:
1
1 and 2 only
2
1, 2 and 3
3
1,2 and 4
4
2 and 3 only