1. After taking the medicine, sometimes there will be head swelling, head jumping pain, rapid heartbeat and even fainting. You can take half a tablet for the first time to avoid and alleviate side effects.
2. Patients with frequent angina pectoris can take it before defecation to prevent the attack.
This medicine can't be swallowed.
4. People with glaucoma should not use it.
5. Long-term continuous service can produce drug resistance.
Sublingual dosage: 0.25 ~ 0.5mg/ time, and then 5 minutes later 1 time as needed. If the pain persists after the total amount reaches 3 tablets within 15 minutes, you should seek medical attention immediately. Intravenous drip: Start with 5μg/min, preferably with a constant flow pump, and increase 5μg/min every 3 ~ 5 minutes, up to 200 ~ 300 μ g/min. Usage of spray: spray 1 ~ 2 when attacking. If the effect is not good, repeat the same dose within 10min. Usage of nitroglycerin patch or plaster: at first, apply 1 tablet to chest skin every day. The dosage can be increased as needed.
References:
Baidu encyclopedia entry nitroglycerin