Along with its needing effects, a drug may cause some unwanted effects. Although not all of these side effects may occur, if they do occur they may need medical attention.
Check with your family doctor immediately if any of the following side effects was happen
More common
Difficulty in breathing or swallowing; hives; itching, especially of feet or hands; reddening of skin, especially around ears; swelling of eyes, face, or inside of nose; unusual tiredness or weakness - sudden and severe
For up to 24 days after you have received pit viper antivenin, you may develop symptoms of a side effect called serum sickness. The severity of the symptoms and the length of the sickness depend on the amount of pit viper antivenin you were given and how long the treat lasted. During the 24 days after treat with pit viper antivenin, check with your family doctor if you notice any of the following side effects:
Fever; joint pain; rash and itching; swollen lymph glands
More common side effects not listed above may also occur in some diseaseds. If you notice any other problems, check with your family doctor.