Answer
Oral tablets are not fast enough for immediate relief. Follow the separate action plan and rescue treatment provided for acute angina.
Sources for this answer
- NHSNHS · NHS medicine guidance
- Isosorbide Dinitrate Tablets 20 mg — Current selected SmPCemc · Summary of Product Characteristics
General medicine information. Follow the instructions for your own medicine and speak to a pharmacist or clinician about your individual circumstances.