The three painkilling drugs available at the Jessop Hospital are Diamorphine, Pethidine and Meptazinol. They are used on your request to relieve pain during labour. They are administered with an injection into the muscle of the thigh or buttock. The drugs can sometimes be given into the bloodstream directly for a faster effect.
There are some devices which can be programmed to allow you to administer the drug yourself (Patient Controlled Analgesia-PCA). These are commonly used for postoperative pain, but are occasionally suitable for pain relief in labour. Pressing a button releases a controlled amount of drug into the blood. Doses can be added until you are comfortable.
These drugs are available to all expectant mothers on request, but individual circumstances are taken into account. The dose given broadly depends upon body weight. You may have more than one dose during labour. Monitoring of the baby's heart rate is done at the midwives discretion (if there are no other reasons to monitor it). Side effects of these drugs are drowsiness, nausea and vomiting. They can slow your breathing down if you have too much. If given close to the birth of your baby, they can slow down the baby's breathing and make him or her sleepy.
These drugs can be of great benefit to you when used within the safe guidelines. In terms of timing:
Diamorphine: in early labour because it has a longer length of action.
Pethidine: in both early labour and a little later on, as it's action is shorter and less likely to affect the baby.
Meptazinol: up to late in the first stage of labour because of it's minimal effects on the baby.
Powerful painkilling drugs give good relief of pain. The effect of each injection is around two to three hours. If given often, in big doses, or too close to the delivery of the baby, they can make you and your baby sleepy and may delay successful breastfeeding.