What is Lymphoseek? Uses, warnings & side effects

Updated May 14, 2025  •  Published Feb 14, 2024

Lymphoseek overview

BRAND NAMES:

  • Lymphoseek

Generic Names:

  • Lymphoseek

Uses:

  • Used to help view the lymph nodes in patients with certain cancers.

Therapeutic Classes:

  • Diagnostic Agent, Radiopharmaceutical Imaging

Forms:

  • Injectable

How it’s taken:

  • By injection

What is Lymphoseek used for?

What form(s) does Lymphoseek come in?

  • Injectable

What are common Lymphoseek dosages?

  • Kit 5 vials

How to take Lymphoseek

  • A doctor or other health professional will give you this medicine. It is given as a shot into your skin, below the areola (area around the nipple), or around a tumor at least 15 minutes before a surgical or test procedure.

What to do if you miss a dose of Lymphoseek

Lymphoseek contraindications - Who shouldn't take Lymphoseek?

  • This medicine is not right for everyone. You should not receive it if you had an allergic reaction to technetium Tc 99m tilmanocept.

Lymphoseek warnings

  • Tell your doctor if you have an allergy to any form of dextran.

  • Your doctor will check your progress and the effects of this medicine at regular visits. Keep all appointments.

  • You will be exposed to radiation when you are given this medicine. Talk with your doctor if you have concerns about this.

  • Tell your doctor if you are pregnant or breastfeeding. Do not breastfeed for at least 24 hours after you receive this medicine. Pump the milk and throw it away.

Lymphoseek interactions & what to avoid when taking Lymphoseek

  • You will be exposed to radiation when you are given this medicine. Talk with your doctor if you have concerns about this.

  • Tell your doctor if you have an allergy to any form of dextran.

  • Tell your doctor if you are pregnant or breastfeeding. Do not breastfeed for at least 60 hours after you receive this medicine. Pump the milk and throw it away.

Lymphoseek side effects - How does Lymphoseek make you feel?

Serious Side Effects

  • Allergic reaction: Itching or hives, swelling in your face or hands, swelling or tingling in your mouth or throat, chest tightness, trouble breathing

Less Serious Side Effects

  • Pain, itching, burning, swelling, or a lump under your skin where the shot is given